Lymphocytopenia overview

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

Overview

Lymphocytopenia, or lymphopenia, is the condition of having an abnormally low level of lymphocytes in the blood. Lymphocytes are a white blood cell with important functions in the immune system. The opposite is lymphocytosis, which refers to an excessive level of lymphocytes.