An abnormally low number of lymphocytes.

an abnormally small number of lymphocytes in the circulating blood

reduced numbers of white blood cells (e.g., CD4 cells).

The condition of having abnormally low numbers of certain white blood cells called lymphocytes. See also -penia.

a decrease in the number of lymphocytes (see above) in the blood.

Below normal levels of the specific white blood cells, the T-cells and the B-cells.

Lymphocytopenia refers to a lower than normal level of lymphocytes. Lymphocytes are a white blood cell with important functions in the immune system.