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Diagnostic Tests The patient's blood is put into different colored tubes, each with its own additive depending on the test being performed: * A purple-top tube is used for a complete blood count (CBC). A CBC measures: 1. The adequacy of your red blood cells, to see if you are anemic 2. The number and type of white blood cells (WBCs), to determine the presence of infection 3. A platelet count (platelets are a blood component necessary for clotting) * A red-top tube is used to test the serum (the liquid or non-cellular half of your blood). * A blue-top tube is used to test your blood's clotting. |