Cytopenia

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Cytopenia is a reduction in the number of cells circulating in the blood. It takes a number of forms:

• Low red blood cell count: anemia.
• Low white blood cell count: leukopenia or neutropenia (because neutrophils make up at least half of all white cells, they are almost always low in leukopenia).
• Low platelet count: thrombocytopenia.
• Low granulocyte count: granulocytopenia
• Low red blood cell, white blood cell, and platelet counts: pancytopenia.

• Polycythemia

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