What is "monocytosis"

n. An increase in the number of circulating monocytes.

n. increase in the number of monocytes in the blood; symptom of monocytic leukemia

Monocytosis is an increase in the number of monocytes circulating in the blood. Monocytes are white blood cells that give rise to macrophages and dendritic cells in the immune system.

In humans, 950/μL is regarded as at the upper limit of normal; monocyte counts above this level are regarded as monocytosis.

Monocytosis has sometimes been called mononucleosis, but that name is usually reserved specifically for infectious mononucleosis.