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What is anemia? What causes anemia? Can inadequate iron cause anemia? What about acute (sudden) blood loss as a cause of anemia? What are other causes of anemia? Can anemia be hereditary? What are the symptoms of anemia? How is anemia diagnosed? What is a complete blood cell (CBC) count? How is blood collected for a complete blood cell (CBC)? What is the red blood cell (RBC) count? What is hemoglobin? What does a low hemoglobin level mean? What is the hematocrit? How is hematocrit determined? How is anemia treated? What are the complications of anemia? What is the outlook (prognosis) for anemia? |
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What is hemoglobin? Where does your hemoglobin come from? What is hemoglobinopathy? What is sickle cell trait? How will I know if I have sickle cell trait? Where can I be tested for sickle cell trait? What is sickle cell disease? What are "sickle cell conditions"? How do you get sickle cell anemia or trait? How common is sickle cell anemia? How is sickle cell anemia detected? How is the testing done? What are the chances of having a baby with sickle cell trait? What are the chances of having a baby with sickle cell disease? What medical problems are caused by sickle cell disease? What should future parents know? How can I be tested? What services are available in Missouri for persons with sickle cell conditions? Where can I get more information about services available in Missouri? What does DHSS offer for adult sickle cell patients 21 years of age and older? What services are available in ________ for persons with sickle cell conditions? Where can I get more information about services available in ________? What does DHSS offer for adult sickle cell patients 21 years of age and older? What causes a low hemoglobin count? Is constantly craving and chewing ice a sign of anemia? |
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What is hemoglobin? Where is hemoglobin made? How is hemoglobin measured? What are normal hemoglobin values? What does a low hemoglobin level mean? What does a high hemoglobin level mean? What is sickle cell disease? What is thalassemia? What is anemia? What is the cause of the low hemoglobin levels? What treatment will you be recommending? How successful is this treatment? Can diet alone help increase the hemoglobin? How long does it take with diet alone to increase the hemoglobin level? What does hemoglobin do? What is hemoglobin? Where does your hemoglobin come from? What is hemoglobinopathy? What is sickle cell trait? How will I know if I have sickle cell trait? Where can I be tested for sickle cell trait? What is sickle cell disease? What are "sickle cell conditions"? How do you get sickle cell anemia or trait? How common is sickle cell anemia? How is sickle cell anemia detected? How is the testing done? What are the chances of having a baby with sickle cell trait? What are the chances of having a baby with sickle cell disease? What medical problems are caused by sickle cell disease? What should future parents know? How can I be tested? What services are available in Missouri for persons with sickle cell conditions? Where can I get more information about services available in Missouri? What does DHSS offer for adult sickle cell patients 21 years of age and older? What is hemoglobin? Where does your hemoglobin come from? What is hemoglobinopathy? What is sickle cell trait? How will I know if I have sickle cell trait? Where can I be tested for sickle cell trait? What is sickle cell disease? What are "sickle cell conditions"? How do you get sickle cell anemia or trait? How common is sickle cell anemia? How is sickle cell anemia detected? How is the testing done? What are the chances of having a baby with sickle cell trait? What are the chances of having a baby with sickle cell disease? What medical problems are caused by sickle cell disease? What should future parents know? How can I be tested? What services are available in Missouri for persons with sickle cell conditions? What does DHSS offer for adult sickle cell patients 21 years of age and older? What causes a low hemoglobin count? Is constantly craving and chewing ice a sign of anemia? What is anemia? Causes of Anemia What types of anemia does NAAC focus on? Healthy and sickle cellCheck out NAAC's feature article on the Hereditary Causes of Anemia. Are some types of anemia inherited? Which people are at the highest risk for anemia? Can certain medications cause a person to become anemic? Symptoms of Anemia What are the symptoms of anemia? What is Anemia? Will I always notice symptoms if I have anemia? Does chewing ice represent a symptom of anemia? How can my doctor know what is causing my symptoms? I have been diagnosed with anemia and my doctor has started treatment; how long will it take for my symptoms to improve? At what point are people considered anemic? What tests might my doctor perform to determine if I have anemia? Physical Examination: The first step in any diagnosis is a physical examination to determine if you have symptoms of anemia and any complications. Your doctor may also ask you some of the following questions to determine if you have any conditions that may be causing your anemia: * Have you or anyone in your family suffered from anemia? * Do you experience heavy menstrual bleeding? (women) * Have you ever had blood in your stool or any other signs of bleeding? * What is your usual diet? * Have you ever had an ulcer? * Do you regularly take aspirin or anti-inflammatory drugs? Is it normal to get an upset stomach, become constipated, or both after taking iron supplements? I have been taking the iron supplements my doctor recommended, so why haven’t my symptoms gone away? Anemia Myths Is hair loss a consequence of anemia? Does a lack of sleep lead to anemia? Blood Donation I tried to donate blood, but was denied because my blood count (hematocrit value) was too low. What hematocrit value is required to donate blood? What should I do about my low hematocrit value? Why are red blood cell transfusions commonly used to treat some patients with anemia? Are there risks for patients receiving blood transfusions? What should I do if my doctor or surgeon tells me that I need a blood transfusion? What are clinical trials and why are they important in developing new drugs and treatments? Can doctors prescribe a drug to patients even if the FDA has not approved the drug for use in their condition? What causes anemia in people with diabetes? What are the benefits of treating anemia in people with diabetes? Iron Deficiency What is iron deficiency anemia and can I correct it by changing my diet? What is the difference between iron deficiency and iron deficiency anemia? I have been diagnosed with iron deficiency anemia and my doctor prescribed iron supplements. How long will it take for my blood to become normal? Restless Leg Syndrome What is Restless Leg Syndrome (RLS)? What causes RLS and is it related to anemia? Can treatment relieve my RLS symptoms? Surgery My hemoglobin level is low and I am scheduled for surgery. Should I postpone the surgery? How long could it take for my hemoglobin level to return to its pre-surgical range if I did or did not receive a transfusion? Women's Health I heard that heavy menstrual periods can cause anemia. Is there anything I can do to prevent the anemia? What is the relationship between uterine fibroid tumors and anemia in women? What causes anemia during pregnancy? Can childbirth cause anemia? What is postpartum anemia? 1. Does exercise affect hemoglobin levels? 2. Is anyone at greater risk of abnormal hemoglobin levels? 3. Are there warning signs for abnormally low hemoglobin levels? 4. Can a healthy diet and nutrition help keep optimal hemoglobin levels? # What is hemoglobin? # What about oxyhemoglobin, carboxyhemoglobin, and methhemoglobin? # How many types of hemoglobin are there? # What is the normal range of hemoglobin? # What can cause hemoglobin to be too high? # What can cause hemoglobin to be too low? # What is the molecular weight of hemoglobin? # Why is it called hemoglobin? What Is Iron-Deficiency Anemia? What Causes It? * What is hemoglobin? * How is hemoglobin measured? * What are normal hemoglobin values? * What does a low hemoglobin level mean? * What does a high hemoglobin level mean? * What is sickle cell disease? * What is thalassemia? Where is hemoglobin made? * Definition of Hemoglobin * Description of Hemoglobin * Questions To Ask Your Doctor About Hemoglobin Definition of Hemoglobin Hemoglobin is the iron-carrying protein found in red blood cells that binds to oxygen. Description of Hemoglobin Hemoglobin is a crystallizable, conjugated protein consisting of an iron-containing pigment (called heme or hematin) and a simple protein, globin. In the lungs, it combines readily with oxygen to form a loose, unstable compound called oxyhemoglobin, a process called oxygenation. In the tissues of the body, where oxygen tension is low and carbon dioxide tension is high, oxyhemoglobin liberates its oxygen in exchange for carbon dioxide. The composition of the globin chain can vary, giving rise to several normal and abnormal forms of hemoglobin. The amount of hemoglobin in the blood averages between 12 and 16 grams/100 milliliters of blood in adult females, about 14 and 18 in males, and somewhat less in children. Function The principal function of hemoglobin is to combine and transport oxygen from the lungs following inhalation, and then deliver it to all body tissues, where it is required to provide energy for the chemical reactions of all living cells. Carbon dioxide (produced as the waste product of these reactions) is transported to the lungs in the blood and is then released when we exhale. Anemia (also see Health Profile: Anemia) Defects in hemoglobin production may be either genetic in origin (for example, sickle cell anemia) or acquired. Anemia is a general term referring to a shortage of red blood cells or a reduction in hemoglobin. If anemia is suspected, a simple blood test can be taken to detect a shortage of red blood cells or hemoglobin. Any adult who has a hemoglobin content of less than 12 grams/100ml blood in women, and less than 13.5 grams/100 ml in men, is diagnosed as having anemia. A specific diagnosis is necessary because each type of anemia has a different cause and therefore, a different treatment. Anemia can be categorized into those caused by decreased production of red blood cells and those caused by increased destruction or loss of red blood cells. For example, anemia may be caused by vitamin or mineral deficiencies, or an inability to absorb certain vitamins, inherited abnormalities in the blood, the failure of the bone marrow to manufacture enough red blood cells or blood loss. People with a poor diet or a history of alcoholism are likely to suffer from one of the types of anemia caused by vitamin and mineral deficiencies. Iron deficiency anemia is caused by a shortage of the mineral iron, which is necessary to produce hemoglobin. This shortage can be caused by a variety of conditions, among them a drastic blood loss such as from an accident; chronic blood loss, such as from a bleeding ulcer; and a diet low in iron. Regularly including foods with a good source of iron in your diet will help prevent iron deficiency. Iron supplements may be prescribed, along with a diet high in iron, to correct the problem. Foods Rich In Iron include Oosters, sardines and shrimp; red meats; dried peas and beans; dark green, leafy vegetables; whole grains; iron-enriched cereals; dried apricots; prunes and raisins. Text Continues Below Questions To Ask Your Doctor About Hemoglobin What is anemia? What is the cause of the low hemoglobin levels? What treatment will you be recommending? How successful is this treatment? Can diet alone help increase the hemoglobin? How long does it take with diet alone to increase the hemoglobin level? What does hemoglobin do? What is anemia? Blood and Bone Marrow Basics linkAnemia develops when there are not enough healthy red blood cells in the body. This condition can be detected when there is a below-normal level of hemoglobin in the blood. Hemoglobin is the iron-rich protein in red blood cells that carries oxygen from the lungs to all parts of the body. If you have anemia, your body doesn’t get enough oxygen-rich blood. As a result, you may feel tired or have other symptoms depending on the severity of anemia. People with severe anemia may feel tired, fatigued or experience shortness of breath which can cause problems carrying out routine activities. Anemia can be a temporary condition, a consequence of other health conditions, or it can be a chronic problem. Many mild types of anemia can be easily treated, however, certain types of anemia may be severe, long lasting, and life threatening if not diagnosed and treated. Also, check out the Blood and Bone Marrow Basics interactive tutorial which gives basic information about blood, blood tests, and bone marrow tests. It explains the different types of blood cells, how they are made, and discusses some of the different types of blood tests and bone marrow tests your doctor might order. Causes of Anemia What types of anemia does NAAC focus on? NAAC focuses on anemia that is caused by iron deficiency, vitamin deficiency, aging, surgery or by acquired chronic conditions like cancer, diabetes, inflammatory bowel disease, kidney disease, heart disease, hepatitis C, HIV/AIDS, and rheumatoid arthritis. These types of anemia are known as iron deficiency anemia, vitamin deficiency anemia and anemia of chronic disease. NAAC has numerous resources devoted to these types of anemia, including the basic education in our Information Handouts, Anemia FAQs, Symptoms Quiz, and the interactive tutorial Blood & Bone Marrow Basics. Hereditary Causes of Anemia Healthy and sickle cellCheck out NAAC's feature article on the Hereditary Causes of Anemia. Are some types of anemia inherited? Certain hereditary variations in a person’s genes can lead to incorrect or decreased production of red blood cells. This can cause red blood cells to not last as long in the blood, not be as effective transporting oxygen from the lungs to different parts of the body, or not be created at all. Some hereditary types of anemia include sickle cell anemia, thalassemia, Diamond Blackfan anemia, and Fanconi anemia. Other hereditary conditions which can lead to anemia include Shwachman Diamond syndrome, red cell membrane disorders, G6PD deficiency, hereditary hemorrhagic telangiectasia, dyskeratosis congenita, congenital dyserythropoietic anemias, and congenital B12 malabsorption syndromes. Read more about these conditions in the article Hereditary Causes of Anemia. Which people are at the highest risk for anemia? Groups of individuals who are at risk for developing anemia include: * Infants who do not receive an adequate amount of iron in their diet * Children going through a rapid growth spurt, during which the iron available cannot keep up with the need for more red blood cells * Women in childbearing years who have an excessive need for iron because of blood loss during menstruation * Pregnant women, in whom the growing fetus creates a high demand for iron People with renal failure, an ongoing gastrointestinal blood loss, or individuals with leukemia or cancer who must receive chemotherapy or radiation to treat their disease are also at-risk for developing anemia. The drugs or radiation used to treat some of these diseases frequently suppress the bone marrow's ability to make red blood cells, white blood cells, and platelets. In addition, many individuals with chronic inflammatory conditions, such as rheumatoid arthritis or chronic infections, may become anemic through a combination of an inadequate supply of iron for red blood cell production and bone marrow suppression. We now recognize that the increased anemia seen in the elderly may be a form of bone marrow suppression from chronic inflammation. Recognition and treatment of the anemia in the elderly has gained clinical interest because correcting the anemia may have beneficial effects on quality of life. Can certain medications cause a person to become anemic? Yes, medications can cause anemia for many different reasons. For example, chemotherapeutic agents often cause anemia because they the bone marrow's ability to manufacture red blood cells, hemoglobin is carried by RBC's, If there are not enough RBC's, the body does not get the right amount of oxygen. Other types of medication-induced anemia are usually unpredictable, and not well understood (such as drug induced aplastic anemia). Some patients react to drugs because of inherited susceptibility, such as patients with glucose-6-phosphate dehydrogenase (G-6-PD) deficiency. G-6-PD is an important enzyme that buffers the mature red cell against oxidative stress. In individuals who are deficient in G-6-PD, exposure to certain chemicals, drugs, or even some foods will result in the alteration of hemoglobin and breakdown of red blood cells. Hemoglobin is the protein molecule in red blood cells; it picks up oxygen from the lungs and delivers it to the body's tissue to maintain the good condition of cells. Although hemoglobin functions primarily as an oxygen carrier, it is also important in the transport of carbon dioxide and in the maintenance of the acid-base balance of the body tissues. Hemoglobin is normally produced by the red blood cells in the bone marrow. It circulates with the cell until it has aged for approximately120 days. When the old cell is filtered from the blood by the spleen, the components of the hemoglobin molecule are either reutilized or excreted. The iron contained in hemoglobin is responsible for the red color of blood. Hemoglobin Levels: In each milliliter of blood there are approximately 4.5 billion red cells and 150 milligrams of hemoglobin. The normal ranges for hemoglobin depend on the age and sex of the person. * Newborns hemoglobin level is 17-22 grams/ 100ml of blood * One month baby is 11-15 grams/ 100ml of blood * Normal hemoglobin level for men is 14-18 grams/100ml of blood. * Normal hemoglobin level for women and children is 12-16 grams/100ml of blood. * Men after middle age is 12-16 grams/ 100ml of blood * Women after middle age is 11.7-13.8 grams/100ml of blood * The body cannot tolerate an acute reduction of more than 30% in the hemoglobin content of the body (as in hemorrhage), if this occur the following symptoms such as dizziness and faintness will result. However, a gradual decrease in hemoglobin over a period of weeks, as in pernicious anemia, may be tolerated until the hemoglobin level is 25% of normal. Low and High Hemoglobin level: * Low hemoglobin level is referred to as being anemic. Cause of anemia includes loss of blood due to surgery, injury, and internal bleeding, nutritional deficiency, bone marrow problem, and abnormal hemoglobin. * High hemoglobin level is seen in smokers and in people living in high altitudes areas. Dehydration can also cause high hemoglobin level; it can be corrected as soon as normal proper fluid balance is restored. Other causes include; bone marrow problem and excessive intake of drug erythropoietin (Epogen) by athletes for blood doping purposes. Fetal Hemoglobin. The blood of newborn infants contains fetal hemoglobin. Fetal hemoglobin has a greater oxygen-carrying capacity at low pH (high acid concentration) than adult hemoglobin. After birth, the infant's red cells produce less fetal hemoglobin and more adult hemoglobin. Abnormalities. The composition of hemoglobin is the same in all people. Abnormalities of the hemoglobin molecule may be produced by genetic mutations, which alter one or more amino acids in the globin chain; these alterations in the genes are very rare. Since genes are inherited, and they contain the information needed to make a protein, if a mutation produces an abnormal hemoglobin gene in a person, the gene will be passed on to his or her children. The children will produce modified hemoglobin identical to that of the parent. Most mutations in hemoglobin produce no problem, but if these alterations occur at certain critical points, severe illness such as sickle-cell anemia and thalassemia may result. Sickle-cell anemia is a serious disease in which there is a replacement of one amino acid in each beta chain by an incorrect amino acid. Symptoms of Anemia What are the symptoms of anemia? Anemia can make you feel tired, fatigued, weak, dizzy, irritable, short of breath or depressed. With anemia, you may also have pale skin, brittle nails, chest pain, a coldness in your hands or feet, or an irregular heartbeat. Some people with anemia also have a desire to eat ice or other peculiar things, experience sexual dysfunction, or have trouble concentrating or performing mental tasks. NAAC Feature Articles * What is Anemia? – This article describes the medical explanations for why anemia develops. It also describes anemia symptoms. * Anemia: Reporting Symptoms and Finding a Cause – This article talks about what patients should know about anemia, it's symptoms and diagnosis if they have been told they are anemic by their doctor. Man falling asleep at a meeting Will I always notice symptoms if I have anemia? Patients with mild anemia may not experience any symptoms, or the symptoms may be so mild that they are not noticeable. As anemia becomes more severe, symptoms can get worse. However, if your anemia develops rapidly, you may notice the symptoms right away. For many people, anemia symptoms can also develop slowly because the body adapts to the condition and reduces the effect of the symptoms. As anemia reduces the amount of oxygen blood can transport, the heart pumps harder to distribute enough oxygen throughout the body. Although this increase in pumping by the heart may delay the onset of symptoms, the muscle of the heart wall thickens under this increased strain, resulting in a condition called left ventricular hypertrophy. As anemia becomes more severe, your body can no longer compensate and the symptoms may become more noticeable.1 Does chewing ice represent a symptom of anemia? Yes, a desire to chew ice is a sign that you may have an iron deficiency and that you could be anemic. This type of abnormal craving for non-food items is called pica. Ice eating is the most common, but eating starch, paper or clay are also common forms of pica and patients will not usually volunteer this type of behavior. Why this craving emerges in iron deficient people is not known. If you recognize a desire to eat these items, or any non-traditional foods, be sure to talk with your doctor about your cravings and habits. How can my doctor know what is causing my symptoms? There is no sure way to know if the symptoms you are experiencing are directly caused by anemia. To find out if you have anemia, your doctor or healthcare professional will need to accurately determine your hemoglobin level by completing a complete blood count (CBC) test. If the results indicate you have anemia, the symptoms you feel may be caused by this lack of oxygen. If your symptoms are relieved after your anemia is corrected, there is a very good chance that anemia was causing these symptoms. I have been diagnosed with anemia and my doctor has started treatment; how long will it take for my symptoms to improve? How quickly your symptoms decline depends on the severity of anemia at the beginning of treatment and the kind of treatment you are receiving. Close communication with your doctor will help him or her provide the treatment that is best for you based on what is causing the anemia. It is important to discuss the risks and benefits of all treatment options with your doctor before beginning treatment. If you received a red blood cell transfusion, your hemoglobin level may immediately return to the normal range. The symptoms caused by anemia may also be relieved very quickly.2 Without receiving a blood transfusion, your body must manufacture new red blood cells to reduce the symptoms related to anemia. It takes about 5-7 days for your body to start making red blood cells. This can result in an increase in hemoglobin levels within 2-3 weeks of starting treatments with erythropoiesis-stimulating agents (ESAS), iron supplements, or vitamin supplements.3 Diagnosing Anemia Anemic Ranges of Hemoglobin and Hematocrit Values Age/Sex (yrs) Hemoglobin (g/dL) Hematocrit (%) Children (0.5-4) < 11.0 < 33 Children (5-12) < 11.5 < 35 Children (12-15) < 12.0 < 36 Adult Men < 13.0 < 39 Non-pregnant Women < 12.0 < 36 Pregnant Women < 11.0 < 33 At what point are people considered anemic? Anemia occurs when a patient has a lower than normal amount of red blood cells. Anemia is assessed by measuring the amount of hemoglobin, the substance in red blood cells that transports and delivers oxygen throughout your body. A doctor can determine if you are anemic by performing a routine blood test called a complete blood count (CBC) test, which provides levels for both hemoglobin and hematocrit (the percentage of red blood cells in a blood sample). The measurement of hemoglobin is the most common method for assessing anemia, although hematocrit values may also be used.4 The normal value or range for these indicators varies with both gender and age. Once a diagnosis of anemia is made by your doctor, more tests, such as iron status tests, are often required to determine the cause of the anemia and the best course of treatment. Anemia is further categorized as mild, moderate or severe depending how far a patient's hemoglobin level resides below the normal range. As important, anemia that develops over a short period of time, such as hours to days, will lead to more symptoms than a case of anemia that slowly develops over months to years. Severity of Anemia Severity Hb Range (g/dL) Symptoms Medical Attention Mild 9.5-13.0 Often no signs or symptoms Commonly remains untreated Moderate 8.0-9.5 May present with symptoms Requires management to prevent complications from developing Severe < 8.0 Symptoms usually present May be life threatening and requires prompt management Elesevier Oncology. Guide to Oncology Drugs and Regimens 2006.6 What tests might my doctor perform to determine if I have anemia? If your hemoglobin and hematocrit tests (as described above) indicate that you may have anemia, your doctor may take additional steps to determine the cause, severity and appropriate treatment for your condition. Some of those additional steps may include the following examinations. Physical Examination: The first step in any diagnosis is a physical examination to determine if you have symptoms of anemia and any complications. Your doctor may also ask you some of the following questions to determine if you have any conditions that may be causing your anemia: * Have you or anyone in your family suffered from anemia? * Do you experience heavy menstrual bleeding? (women) * Have you ever had blood in your stool or any other signs of bleeding? * What is your usual diet? * Have you ever had an ulcer? * Do you regularly take aspirin or anti-inflammatory drugs? Bleeding: Loss of blood, or bleeding is a common cause of anemia. This bleeding may go unrecognized until you begin to suffer from the anemia. If your doctor suspects a source of bleeding within your body, several tests may be used to discover the source of the bleeding. One of the first tests ordered is the fecal occult blood test. This test checks the stool for signs of blood and can detect even small amounts of blood. This simple, noninvasive test is done by placing a small sample of stool on a chemically treated card. Then a chemical solution is put on top of the sample. If the card turns blue, there is blood in the sample. Vitamin Deficiencies: Your doctor may check the amount of folate, vitamin B-12 and vitamin C in your blood to determine if your anemia is due to a vitamin deficiency. Iron Deficiency: Since iron deficiency is the most common cause of anemia, your doctor may conduct some blood tests to check the level of iron in your blood. Some common iron status tests are: * Serum ferritin - Ferritin is a protein that helps store iron in the body. Results of this test give doctors a good idea of how much of the body's stored iron has been used up. * Transferrin level or total iron-binding capacity - Transferrin is a protein that carries iron in the blood. Total iron-binding capacity measures how much of the transferrin in the blood is not carrying iron. People with iron-deficiency anemia have a high level of transferrin that is not carrying iron. Chronic Illness: Because anemia may be the first symptom of a serious illness, determining its cause is very important. This may be difficult, particularly in the elderly, malnourished, or people with chronic diseases, whose anemia may be caused by one or more factors. Treatment: Your doctor will use these and other tests to help determine the best course of treatment for you.7 Treating Anemia Patients Guide to Oral Iron Hand holding pillsCheck out NAAC's feature article, A Patient's Guide to Oral Iron. Is it normal to get an upset stomach, become constipated, or both after taking iron supplements? Many people who take iron supplements experience side effects that make it difficult to follow the recommended dosing. It has been estimated that up to 25% of patients who take iron supplements will experience side effects in their digestive tract – most commonly an upset stomach, constipation, or both. Iron supplements are absorbed better if taken one hour before meals. However your doctor may tell you to take your iron with food to reduce an upset stomach. Also, starting with half the recommended dose and gradually increasing to the full dose may help minimize these side effects. If iron makes you constipated, consider taking a stool softener such as docusate sodium along with your iron. I have been taking the iron supplements my doctor recommended, so why haven’t my symptoms gone away? In order to correct anemia, your body must manufacture new red blood cells to replace those that were lost. It takes about 5-7 days to start developing red blood cells which should increase hemoglobin levels within 2-3 weeks of starting iron supplementation. Therapeutic doses of iron (50-60 mg of oral elemental iron twice daily) should increase hemoglobin levels by 0.7-1.0 g/dL per week.3 You may need to continue to take an iron supplement for several months in order to build up iron stored in your body and prevent anemia from returning. Therefore, it is important to take pills for as long as your doctor recommends, even if your symptoms have lessened or disappeared. The most common reason iron therapy fails is because doses are not fully taken or they are not taken properly.8 The amount of iron absorbed decreases as you take larger doses of iron. For this reason, it is recommended that most people take their iron supplements in two or three equally spaced doses.9 In order to decrease side effects, iron supplements are often taken with food – but it is important to note this may decrease iron absorption by as much as 40-66%.8 Since you are receiving less iron this way, you may need to take your supplement for a longer period of time for it to have the same effect. Anemia Myths Is hair loss a consequence of anemia? Anemia Myth Busters Feature Articles NAAC’s Anemia Myth Busters series discusses some commonly recognized symptoms, causes, behaviors and acquired conditions which may have correctly or incorrectly become associated with anemia. Check out the first installment: * #1: Ice Chewing, Hair Loss, Lack of Sleep Anemia does not cause your hair to fall out either temporarily or permanently. But some patients may have anemia when something else causes their hair to fall out. This can happen because the same factors that may lead to anemia, such as vitamin deficiency, hyperthyroidism or cancer chemotherapy, may cause hair loss; so an association between hair loss and anemia is fairly common. There are several reasons you may start to lose hair, including a family history of hair loss, diabetes, skin conditions like lupus erythematosus or lichen planus, certain thyroid conditions, hormonal changes, emotional or physical stress, excessive use of hair products or hair-styling techniques which pull the hair, poor nutrition, some extreme diets, and radiation therapy or chemotherapy.40 Discussing unexpected hair loss and any anemia-related symptoms with your doctor may help him or her provide the treatment that is best for you based on what is causing your symptoms. Does a lack of sleep lead to anemia? A lack of sleep does not directly cause anemia. Some people may, however, think the two are connected because people with anemia and people who are not getting enough sleep can experience some of the same symptoms. A few of these overlapping symptoms can include fatigue, weakness, irritability and lack of concentration. Despite no documented direct link, there is a chance that a reason for missing sleep, like an illness or general discomfort, could also be contributing to anemia. Blood Donation I tried to donate blood, but was denied because my blood count (hematocrit value) was too low. What hematocrit value is required to donate blood? What should I do about my low hematocrit value? Hematocrit is a measure of the percentage of red blood cells in a blood sample. To donate blood, a person's hematocrit value must be above the threshold of 38%, a level which is established by the U.S. Food and Drug Administration (FDA). If you are found to have a low hematocrit value, you will not be able to donate blood on that particular day. Having a low hematocrit is the most frequent reason for not being able to donate blood. It is normal for hematocrit values to vary from day to day or even hour to hour and values can be influenced by such things as diet, hydration and health issues. Being deferred from donation due to a low hematocrit does not always mean that you have anemia or a medical problem. However, if you have been denied from donating blood because of a low hematocrit value it is possible that you have anemia. Decreased hematocrit often indicates anemia caused by an iron or vitamin deficiency. Further testing may be necessary to determine if you are anemic and if so, the cause of the anemia. If you find your hematocrit value is low or think you might be anemic, you should schedule an appointment with your doctor. New Section: Anemia & Blood Donation Blood Transfusion Learning About Blood Transfusions Current guidelines recommend that medical professionals assess hemoglobin level and severity of anemia-related symptoms to determine if a patient needs a blood transfusion. More information about the use of blood can be found in the article Treating Anemia with Red Blood Cell Transfusions.Blood bags Why are red blood cell transfusions commonly used to treat some patients with anemia? Transfusions of red blood cells are commonly given to patients who have experienced major blood loss from physical trauma, those who are critically ill, or those who have recently undergone surgery.41 In these anemic patients blood transfusions are often administered because they may save lives by quickly increasing blood volume and raising the hemoglobin level to normal or near-normal levels. It is also common for patients with hemoglobin levels at or below 7-8 g/dL and exhibiting significant fatigue or other anemia-related symptoms to be given blood transfusions. However, it is extremely important for your doctor to identify the cause of the anemia and correct it accordingly. Are there risks for patients receiving blood transfusions? Blood transfusions are much safer than ever before, however they do come with some risks. For instance, transfused blood can introduce pathogens directly into the blood stream, it can lead to possibly fatal reactions, or it can cause changes in the patient’s immune system that may lead to other serious reactions and infections. Additionally, several studies have shown that patients who receive transfusions, on average, stay in the hospital longer, have higher hospital bills, and are generally more ill than patients who did not receive a transfusion.42 Some studies have even shown a greater likelihood of death in extensively transfused patients.43 What should I do if my doctor or surgeon tells me that I need a blood transfusion? For patients who have lost a considerable amount of blood there may be little you can do before receiving the blood transfusion to quickly raise your blood volume and hemoglobin level. A blood transfusion can be a life-saving treatment for many patients undergoing surgery or for patients in the emergency room. If you are not in critical condition and you do not immediately need the transfusion, it is important to discuss treatment options for anemia with your doctor. This can include asking your doctor what is causing your anemia, if there is anything that can be done to prevent the need for a transfusion, and what are the risks of receiving a transfusion or choosing not to receive a transfusion. If you are scheduled to have surgery, also check out NAAC's Anemia & Surgery handout and additional Anemia FAQs on Surgery. Clinical Trials Clinical Trials & Drug Approval If you are a patient interested in learning about how clinical trials test the safety and effectiveness of new drugs and treatments, read the article Clinical Trials and FDA Review Safety and Effectiveness of New Drugs and visit the Clinical Trials section.Blood and Bone Marrow Basics link What are clinical trials and why are they important in developing new drugs and treatments? Clinical trials are research studies with volunteer patients that investigate complicated health-related questions. Some trials study how different diseases affect patients in natural settings and other trials explore the safety and effectiveness of drugs or therapies used to treat patients with a specific disease. These two types of studies are called observational trials (those which observe patients in natural settings) and interventional trials (those which test drugs and new types of treatments). Investigational clinical trials are important to make sure drugs and treatments are safe for patients and effective at treating specific diseases and symptoms. This knowledge comes from studying the information and data that is gathered over the course of one or several clinical trials which test a type of drug or treatment. The results and conclusions about what happened during the study can then help doctors make informed decisions about the effectiveness and safety of the drugs and treatments which they recommend to patients. Can doctors prescribe a drug to patients even if the FDA has not approved the drug for use in their condition? Yes. Once a drug has been approved for one purpose physicians are free to prescribe it for any other purpose that – in their professional judgment – is both safe and effective. They are not limited to official, FDA-approved indications printed on the label. This “off-label” prescribing is done when medications have been found to be effective for new uses but have not had the formal (and often costly) applications and studies required by the FDA to formally approve the drug for these new indications. However, when physicians use a drug to treat a different indication there is usually extensive medical literature to support the off-label use. Erythropoietin and darbepoietin, for example, are commonly prescribed off-label for various types of anemia including anemia of chronic disease, anemia in the elderly, and postpartum anemia. Diabetes More Diabetes Materials Medical device What causes anemia in people with diabetes? Long-standing diabetes can affect your kidneys (known as diabetic nephropathy) and your nerves (known as diabetic neuropathy).10,11 When diabetes affects your kidneys, they may not be able to produce enough erythropoietin, a hormone that controls production of red blood cells.10 When diabetes affects your nerves, your body many not be able to properly signal the kidneys to produce more erythropoietin in response to anemia.11 Both diabetic nephropathy and neuropathy may contribute to the development of anemia. Some medications used to treat diabetes, hypertension and other related conditions may add to the risk of anemia. Diabetes medications called thiazolidinediones (Avandia and Actos) as well as metformin (Glucophage) can increase the risk of developing anemia.12 What are the benefits of treating anemia in people with diabetes? Correction of anemia can reduce your symptoms related to anemia, which may include fatigue, weakness, pale skin, chest pain, dizziness, irritability, numbness or coldness in your hands and feet, trouble breathing, a fast heartbeat, and headache. Studies have shown that treating anemia in diabetics may decrease hospital admissions10 and may also slow down the development of some of the complications of diabetes, including damage to the nerves, the eyes and the kidneys.13 Iron Deficiency What is iron deficiency anemia and can I correct it by changing my diet? Iron builds muscle proteins, healthy bones, and most importantly, it helps blood cells carry the oxygen the body needs for energy. Iron deficiency anemia develops when the body has had a low level of iron for a long time. It can be caused by blood loss, not eating or absorbing enough iron, or by an increased demand for iron (like pregnancy or rapid growth). For people with anemia, getting enough iron in their diet is an easy, natural way to begin improving their well-being. But, iron supplementation may be necessary in order to raise the low iron levels which are causing iron deficiency anemia. In the case of poor absorption, supplemental iron may need to be given intravenously (through an IV) or vitamin C intake may be increased to help the body absorb the iron from food. Additional feature articles: Patient’s Oral Iron Guide | Nutrition: The Importance of Iron Information handout: Iron Deficiency Anemia What is the difference between iron deficiency and iron deficiency anemia? Iron deficiency occurs when the body is low in stored iron. Iron deficiency may not cause any symptoms and is often not recognized. When it is detected, it can be treated with iron supplementation. If the low iron level or its cause is not corrected, it can lead to muscle weakness and eventually lead to iron deficiency anemia. Iron deficiency anemia is a condition that develops when a low iron level persists and prevents the body from making enough healthy red blood cells. The body can make red blood cells, even when it has an iron deficiency, but eventually the shortage of stored iron can slow that process and cause anemia. Iron deficiency anemia often leads to symptoms of fatigue, which may lead sufferers to seek medical attention. When iron deficiency anemia is diagnosed it is almost always treated, since untreated anemia can cause damage to the heart and other organs. I have been diagnosed with iron deficiency anemia and my doctor prescribed iron supplements. How long will it take for my blood to become normal? The recovery time depends on the degree of anemia at the beginning of treatment, the absorption of iron from the stomach and the kind of iron pills one is taking. Most people with mild to moderate iron deficiency anemia will correct the anemia over a period of 2-3 months. However, even when the anemia is corrected, the iron stored by the body is still low. Physicians often recommend an additional 6 months of oral iron therapy once the anemia has been reversed in order to reach a normal level of stored iron. This will help prevent iron deficiency anemia from recurring quickly. Restless Leg Syndrome What is Restless Leg Syndrome (RLS)? Restless legs syndrome (RLS) is a condition in which your legs feel extremely uncomfortable while you're sitting or lying down. It makes you feel like getting up and moving around. When you do so, the unpleasant feelings temporarily goes away. People suffering from RLS describe the sensations as burning, creeping, tugging, or like insects crawling inside the legs. The sensations can be uncomfortable, irritating, or possibly even painful. These symptoms become worse during the early evening or later at night and can disrupt sleep, leading to insomnia and daytime drowsiness.14 It has been estimated that approximately 10% of adults in North America and Europe experience RLS symptoms.15 RLS is not a dangerous or life threatening condition, but it can be painful and disrupt everyday life. What causes RLS and is it related to anemia? There is no known definitive cause for restless leg syndrome but one area of interest is its connection with iron deficiency and iron deficiency anemia. Iron deficiency and iron deficiency anemia are the most common medical conditions associated with RLS and are present in more than 20% of all cases.16 Two other major factors related to RLS include renal disease and pregnancy, which are frequently accompanied by iron deficiency anemia.17 More recent studies have shown that decreased levels of stored iron in the body can make RLS symptoms worse.18,19 Additionally, researchers have found that not enough iron was getting to the brain cells of people who suffer from the symptoms of restless legs.20 Can treatment relieve my RLS symptoms? Increasing the body’s stored iron can provide relief of symptoms in some RLS patients, especially those with iron deficiency.20 While oral iron supplements have shown benefit in these patients, IV iron may be needed in order to replenish low iron levels in the brain. A recent study showed that treatment with IV iron led to almost complete relief of the RLS symptoms in a small group of patients.17 Close communication with your doctor will help him or her provide the treatment that is best for you. Surgery My hemoglobin level is low and I am scheduled for surgery. Should I postpone the surgery? If you have a low hemoglobin (Hb) level, you should discuss this with your doctor as soon as possible. No treatment may be necessary if minimal blood loss is expected during a minor procedure. If a greater blood loss is expected for more extensive procedures, you should ask your doctor about being treated with erythropoietin and iron to raise your hemoglobin to a normal level before surgery. An anemic patient who undergoes high-blood-loss surgery has a greater risk of surgical complications and need for a blood transfusion, which also carries some risk. Some physicians advocate measuring a patient's hemoglobin 30 days before surgical procedures. This allows time to identify and treat the anemia and its cause.21 There is a general consensus among surgeons, anesthesiologists, and internists to postpone surgery if a patient has severe anemia (Hb ≤ 8 g/dL).22 While many healthy adults are able to handle anemia before surgery 23 without any problem, elderly adults may not tolerate it as well. A recent study of elderly patients undergoing major non-heart surgery found that even mild anemia increased the risk of heart trouble or death after surgery.24 The treatment of anemia before surgery with iron, erythropoietin, or red blood cell products and their substitutes is possible for most major elective surgeries and can help prevent adverse outcomes, especially in elderly patients. How long could it take for my hemoglobin level to return to its pre-surgical range if I did or did not receive a transfusion? A hemoglobin level at or below 7 g/dL following surgery may require a blood transfusion. Each unit of transfused blood (300ml) is expected to raise circulating hemoglobin level by about 1 g/dL.25 A blood transfusion replaces the red blood cells and hemoglobin (Hb) lost during surgery and may immediately return your hemoglobin level to its pre-surgical range. The symptoms of anemia (if present) may be relieved quickly, but the increase in hemoglobin level may only be temporary.2 This is because the red blood cells in a blood transfusion do not last as long as the red blood cells your own body will make after surgery. If you receive a blood transfusion, your hemoglobin level will initially increase, but it could still take your body several weeks to regularly produce enough healthy red blood cells to sustain the pre-surgical hemoglobin level. If you do not receive a transfusion following surgery, it may take several weeks to sometimes two months to raise your hemoglobin level to its pre-surgical range. This is because your body must make new red blood cells to replace those that were lost during the surgical procedure. It normally takes about five to seven days to make a healthy red blood cell, but the normal course of healing and inflammation from the surgery can slow down the production of red blood cells.26,27 Anemia Rates After Surgery Time After Surgery Percentage with Corrected Anemia One week Very few 2-4 weeks One-third 6 weeks Two-thirds Karkouti K, et al. Can J Anaesth. 2006.28 Several studies have shown that without treatment, anemia is almost never corrected within one week after surgery. With appropriate therapy, about one-third of patients will have their anemia corrected two to four weeks after surgery and two-thirds within six weeks after surgery.28 Patients with more severe anemia, and those who suffer from anemia of chronic disease before their surgery may take longer than six weeks to recover.28 Your doctor may recommend an oral iron supplement to shorten the time it takes to recover. In some circumstances, a blood transfusion may be necessary, but concerns about the risks involved have restricted their use. Blood transfusion has many known adverse effects including potential transmission of infectious diseases, allergic reactions, and decreased immune function.29,30 Additionally, treatment with erythropoiesis-stimulating agents (ESAs) and iron have been shown to increase the rate of red blood cell production and may also help hemoglobin levels return to normal in surgery patients.31-33 Women's Health I heard that heavy menstrual periods can cause anemia. Is there anything I can do to prevent the anemia? Heavy menstrual bleeding, also known as menorrhagia, is one common cause of iron deficiency anemia for women. Heavy menstrual bleeding has been reported in approximately 10-15% of all women at some point during their life. Among these women, as many as 20% will go on to develop iron deficiency anemia.34 You can begin to replace the iron lost from blood loss by eating more iron-rich foods, but supplemental oral iron medications may be required. Discuss your concerns with your doctor or gynecologist. To learn more, read our feature article Women and Anemia – Heavy Menstrual Bleeding and Fibroids. What is the relationship between uterine fibroid tumors and anemia in women? Anemia in women can be caused by the increased menstrual blood loss associated with uterine fibroid tumors. Uterine fibroids are noncancerous growths in the uterus that often appear during childbearing years. They almost never lead to cancer, and are not linked to any increased risk of cancer.35 Along with a healthy diet, iron supplementation may be required to prevent iron deficiency anemia from developing. To learn more about fibroid tumors, read our feature article Women and Anemia – Heavy Menstrual Bleeding and Fibroids. What causes anemia during pregnancy? Pregnancy places major demands on the body because the mother must meet the needs of both her body and her growing baby. The mother’s body needs enough iron and folate to make the right amount of red blood cells.36 Most anemia during pregnancy results from this increased need for iron. It is estimated that women will need approximately 50% more iron during pregnancy, increasing from 18 to 27 milligrams (mg) per day.37 Even a well-balanced diet can only provide about 12-14 mg of iron per day, well short of the iron a pregnant woman requires. In order to prevent iron deficiency anemia during pregnancy, it is often necessary for pregnant women to take iron supplements. The Centers for Disease Control and Prevention (CDC) recommends that all pregnant women should take a daily supplement of 30mg of elemental iron. The expectant mother should also stay in close contact with her doctor and gynecologist, and be sure to eat a diet that includes foods rich in iron and folate, like liver and dark green leafy vegetables. Read our feature articles to learn more about anemia caused during pregnancy, from vitamin deficiencies or from iron deficiency. Can childbirth cause anemia? What is postpartum anemia? Approximately 10% of women will suffer from anemia within the first six months after delivering their baby38 and 4% of women will have anemia lasting up to twelve months.39 Anemia experienced by mothers during this time following childbirth is called postpartum anemia and is usually caused by iron deficiency. Mothers suffering from postpartum anemia most likely lost a large amount of blood during childbirth, had twins or other multiple births, or were anemic during the third trimester of pregnancy.9 In any case, losing large amounts of blood or having low iron levels leaves the mother at risk for developing anemia. Following childbirth, the mother’s body needs to start making new red blood cells. To do so, she will need enough iron to make hemoglobin, the part of the red blood cell that carries oxygen throughout the body. If she has anemia and there is not enough stored iron, her body will be unable to raise hemoglobin levels and reverse the anemia. Low iron levels before and after childbirth may require treatment. Close communication with your doctor and gynecologist will help him or her provide the best care to prevent anemia prior to child birth and treat postpartum anemia. To learn more about postpartum anemia, read our feature article Women & Anemia – Childbirth and Postpartum Anemia. 1. Does exercise affect hemoglobin levels? 2. Is anyone at greater risk of abnormal hemoglobin levels? 3. Are there warning signs for abnormally low hemoglobin levels? 4. Can a healthy diet and nutrition help keep optimal hemoglobin levels? 1. Does exercise affect hemoglobin levels? No, except that dehydration can temporarily increase hemoglobin levels. 2. Is anyone at greater risk of abnormal hemoglobin levels? Women of childbearing age may have temporary decreases during menstrual periods and pregnancy. 3. Are there warning signs for abnormally low hemoglobin levels? Some warning signs are fatigue, fainting, pallor, and shortness of breath. 4. Can a healthy diet and nutrition help keep optimal hemoglobin levels? A healthy diet containing vegetables and foods high in iron can be beneficial. # What is hemoglobin? # What about oxyhemoglobin, carboxyhemoglobin, and methhemoglobin? # How many types of hemoglobin are there? # What is the normal range of hemoglobin? # What can cause hemoglobin to be too high? # What can cause hemoglobin to be too low? # What is the molecular weight of hemoglobin? # Why is it called hemoglobin? FEATURED BOOKS ON BLOOD TESTS, LAB VALUES, AND MEDICAL TESTS FROM BARNES & NOBLE.COM: Medical Tests That Can Save Your Life: 21 Tests Your Doctor Won't Order ...Unless You Know to AskThe Yale University School of Medicine's Patient's Guide to Medical Tests WHAT IS HEMOGLOBIN? Hemoglobin (abbreviated Hb) is a red substance (made of iron and protein) in the blood that carries oxygen to the cells in the body from the lungs. Hemoglobin also carries carbon dioxide away from the cells to the lungs, which is then exhaled from the body. Carbon dioxide is a colorless and odorless gas that is present in small amounts in the air and is produced as a result of metabolism in the body. Metabolism is the chemical actions in cells that release energy from nutrients or use energy to create other substances. Each red blood cell contains 200-300 molecules of hemoglobin. Red blood cells help carry oxygen in the blood due to the presence of hemoglobin. A molecule is a combination of atoms. An atom is the smallest part of a substance that can exist alone or in combination with something else. Each molecule of hemoglobin contains 4 groups of heme. Heme is the iron component of hemoglobin. Each group of heme can carry one molecule of oxygen. A hemoglobin molecule also contains 4 globin polypeptide chains composed of amino acids. Amino acids are a group of chemical substances that form proteins. Globin is a type of protein. A polypeptide chain is simply a long chain of amino acids. Overall, each hemoglobin molecule consists of about 3.8% heme and 96.2% globin. Each polypeptide chain is made of 141 to 146 amino acids. When one of these amino acids is removed, added, or replaced by another amino acid, it changes in chemical structure. Different types of hemoglobin are identified by their specific combinations of polypeptide chains. The most common hemoblobin types are alpha and beta hemoglobin, while δ (delta) and γ (gamma) hemoglobin are less common. Hemoglobin contains 4 types of polypeptide chains. There are two polypeptide chains (known as alpha globin chains) that contain 141 amino acid residues. There are other chains that contain 146 amino acids. These chains are known as beta, δ and γ ε (epsilon), or ξ (xi). The production of each type of polypeptide chain is controlled by a gene with a similar Greek letter. Genes are units of material contained in a person's cells that contain coded instructions as for how certain bodily characteristics (such as eye color) will develop. WHAT ABOUT OXYHEMOGLOBIN< CARBOXYHEMOGLOBIN, AND METHHEMOGLOBIN? In an atmosphere in the body with a normal concentration of oxygen (such as the lungs), hemoglobin combines with oxygen to form oxyhemoglobin. Oxyhemoglobin brings oxygen from the lungs to the tissues. When the oxygen is released, oxyhemoglobin changes back to hemoglobin. In an atmosphere in the body with low oxygen concentration (such as peripheral tissues of the body), exposure to certain chemicals cause oxygen to be replaced with carbon dioxide, a stable substance. The combination of carbon dioxide and hemoglobin is known as carboxyhemoglobin. Hemoglobin releases carboxyhemoglobin in the lungs (which is exhaled) and picks up more oxygen to bring to the cells. When people inhale exhaust fumes from gasoline engines, the chemicals from the fumes displace oxygen from oxyhemoglobin and cause the formation and buildup of carboxyhemoglobin. The buildup of this chemical can lead to suffocation. Methhemoglobin is a substance formed when the iron in hemoglobin is oxidized (loses an electron). An electron is a negatively charged particle that is smaller than an atom. Methemoglobin cannot carry oxygen, which makes it a dangerous substance. It is typically formed in response to certain chemicals, such as nitrates (a form of nitrogen, a type of natural element). HOW MANY TYPES OF HEMOGLOBIN ARE THERE? Several hundred types of hemoglobins have been identified and classified with different abilities to move through liquid in response to changes in an electric field. Examples of hemoglobin types include C, D, E, G, H, I, J, K, L, M, N, O, and S. The reason there are so many types of hemoglobin is because amino acids can easily substitute for another type of amino acid in the polypeptide chain. Whenever this happens, a new type of hemoglobin is formed. Some types of hemoglobin are abnormal not because one or more amino acids were substituted, but because it has been completely deleted. In humans, there are 5 types of normal hemoglobin, meaning that other types of hemoglobin are abnormal. Two types of normal hemoglobin are present in embryos: Hb Gower-1 and Hb Gower-2. An embryo is a fertilized egg from the time of conception until the 8th week of pregnancy. Normal hemoglobin in the fetus is known as Hb F. A fetus is a developing human that is inside the mother from the end of the 8th week to birth. There are 2 normal types of hemoglobin in adults, known as Hb A and Hb A2. The clinical significance of abnormal types of hemoglobin is mostly unknown, but the significance of some is known. There may be many more types of hemoglobin yet to be discovered. When a new type of hemoglobin is discovered, it is first assigned a name, usually named after the location where it was discovered. Then a formula is determined to list the types of molecules that make up the new type of hemoglobin. The formula consists of Greek letters to designate the basic polypeptide chains. If there are two identical polypeptide chains, then the subscript 2 is added to the formula. Sometimes a superscript letter may be added to the formula. For example, the superscript A means that it is hemoglobin A, a normal type of hemoglobin. Sometimes, there may be a superscript number, which is used to designate where along the polypeptide chain an abnormal substitution occurred. So if the superscript 121 was present, this would mean the abnormal substitution occurred at the 121st chain. The nature of the substitution would be described next to the number in superscript as well. Hundreds of different types of hemoglobin are detailed at the Online Mendelian Inheritance in Man Project. WHAT IS THE NORMAL LEVEL OF HEMOGLOBIN? The normal level of hemoglobin is 12 to 16 g/dL in women and 13.5 to 18 g/dL in men. g/dL stands for grams per deciliter. A gram is a very small unit of weight. You would need about 453 grams just to get one pound. A deciliter is one tenth of a liter. WHAT CAN CAUSE HEMOGLOBIN TO BE TOO HIGH? If hemoglobin is too high this can mean there is congenital heart disease, which is heart disease one is born with. High hemoglobin levels can be due to increased red blood cell formation associated with too much erythropoietin (a type of hormone that stimulates the production of red blood cells). Hormones are natural chemicals produced by the body and released into the blood that have a specific effect on tissues in the body. High hemoglobin levels can be caused by polycythemia vera. Polycythemia vera is a condition of unknown cause in which there is a long-term increase in red blood cells and other types of cells. High hemoglobin levels can be caused by pulmonary fibrosis, which is the formation of scar tissue in the connective tissue of the lungs. High hemoglobin levels can also be caused by cor pulmonale, which is enlargement of the heart’s right ventricle cause by lung disease. The right ventricle is an opening in the heart that pumps out blood with the low level of oxygen to the lungs. WHAT CAN CAUSE HEMOGLOBIN TO BE TOO LOW? Hemoglobin can be too low because of lead poisoning, bleeding, poor nutrition (not enough nutrients such as iron, folate, vitamin B-12, or vitamin B-6), too little erythropoietin (see prior section) due to kidney disease. Other causes include overhydration (too much water in the body) and red blood cell destruction associated with a bad reaction to a blood transfusion. A disease that is defined by too little hemoglobin in the blood is known as anemia. There are various types of anemia. WHAT IS THE MOLECULAR WEIGHT OF HEMOGLOBIN? The molecular weight of hemoglobin is 64,450. The molecular weight is how much the molecule weighs. WHY IS IT CALLED HEMOGLOBIN? Hemoglobin comes from the Latin word "haima" meaning "blood," and the Latin word "globus" meaning "ball." Put the words together and you have "blood ball." What Is Iron-Deficiency Anemia? What Causes It? http://kidshealth.org/parent/medical/heart/ida.html The body needs iron to make hemoglobin. If there isn't enough iron available, hemoglobin production is limited, which in turns affects the production of red blood cells (RBCs). A decreased amount of hemoglobin and RBCs in the bloodstream is known as anemia. Because RBCs are needed to carry oxygen throughout the body, anemia results in less oxygen reaching the cells and tissues, affecting their function. Iron-deficiency anemia (IDA), often caused by insufficient iron intake, is the major cause of anemia in childhood. It has become much less common in the United States over the past 30 years, primarily due to iron-fortified infant formulas and cereals. Iron-deficiency anemia doesn't develop immediately. Instead, a person progresses through stages of iron deficiency, beginning with iron depletion, in which the amount of iron in the body is reduced while the iron in RBCs remains constant. If iron depletion isn't corrected, it progresses to iron deficiency, eventually leading to IDA. What Causes It? Iron-deficiency anemia can be the consequence of several factors, including: * insufficient iron in the diet * poor absorption of iron by the body * ongoing blood loss, most commonly from menstruation or from gradual blood loss in the intestinal tract * periods of rapid growth A diet low in iron is most often behind IDA in infants, toddlers, and teens. Kids who don't eat enough or who eat foods that are poor sources of iron are at risk for developing the condition. Poverty is a contributing factor to IDA because families living at or below the poverty level may not be getting enough iron-rich foods. |