Leukocytosis vs. Leukopenia

Leukocytosisnoun

an abnormal increase in the number of white blood cells in the blood as a result of infection (as in leukemia)

Leukocytosis

Leukocytosis is a condition in which the white cell (leukocyte count) is above the normal range in the blood. It is frequently a sign of an inflammatory response, most commonly the result of infection, but may also occur following certain parasitic infections or bone tumors as well as leukemia.

Leukopenianoun

(medicine) An abnormally low count of leukocytes, or white blood cells, in the blood.

Leukopenianoun

an abnormal lowering of the white blood cell count

Leukopenia

Leukopenia (from Greek λευκός (leukos) 'white', and πενία (penia) 'deficiency') is a decrease in the number of leukocytes. Found in the blood, they are the white blood cells, and are the body's primary defense against an infection.