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Monocytes are large white blood cells that patrol the bloodstream and migrate into tissues, where they mature into macrophages — the immune system's long-lived cleanup crew that engulfs debris, pathogens, and dead cells. Elevated monocytes (monocytosis) are associated with chronic inflammation, autoimmune disease, certain infections, and some leukaemias. Persistently elevated monocytes even within the reference range predict cardiovascular events, because tissue macrophages play a central role in atherosclerotic plaque formation.
Also known as: MONO, Monocyte, Monocytes, Monos
Elevated monocytes are seen in chronic infections like tuberculosis, autoimmune diseases, and myeloproliferative disorders. Low monocytes are uncommon but occur with aplastic anemia.
Standard range is 0.2-0.9 K/uL. Optimal is 0.2-0.6 K/uL. Persistently elevated monocytes above 0.5 K/uL are associated with atherosclerotic plaque development.