What is hematology? What does a hematologist do? Who studies hematology? What is the difference between a hematologist and a hematopathologist? What does a hematologist do? Those individuals who choose to work solely in the area of hematology must have or develop an intimate knowledge of cells that are found in blood, bone marrow and body fluids, how they are formed, how they mature, and the changes that occur in diseased states. In addition, they must be able to work with instrumentation that is used to count cells and validate the results derived from these instruments. Hematologists might work in special areas such as special stains, electrophoresis, flow cytometry, or coagulation (the study and identification of blood clotting disorders or hemorrhage). Those who work with special stains, flow cytometry, or electrophoresis must develop even more specialized skills that are used to identify very specific disease states or disorders. What does a clinical laboratory scientist do? Clinical Laboratory Scientists assist physicians and other primary care providers in determining the cause of patient disease and to assess extent of the disease process and therapy. They work behind the scenes and are seldom seen or noticed by most patients or visitors. The closest contact most patients have with the CLS professional is when the patient has their blood drawn. The complete blood count (CBC) is one of the most commonly ordered blood tests. The complete blood count is the calculation of the cellular (formed elements) of blood. These calculations are generally determined by special machines that analyze the different components of blood in less than a minute. A major portion of the complete blood count is the measure of the concentration of white blood cells, red blood cells, and platelets in the blood.