A CBC test provides information about the number of cell types, size, shape, and some of the physical characteristics of the cells. A major portion of the complete blood count measures the concentration of white blood cells (WBCs), red blood cells (RBCs), and platelets in the blood. This test is used to help diagnose the cause if the patient is having any symptoms such as fatigue, weakness, or has an infection, inflammation, bruising, or bleeding. Significant INCREASES in WBCs may help confirm that an infection is present and suggest the need for further testing to identify its cause. DECREASES in the number of RBCs (anemia) can be further evaluated by changes in size or shape of the RBCs to help determine if the cause might be decreased production, increased loss, or increased destruction of RBCs. A platelet count that is LOW or extremely HIGH may confirm the cause of excessive bleeding or clotting and can also be associated with diseases of the bone marrow such as leukemia.
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