Monocytes (count and %)

The normal reference range for Monocytes (count and %) is Monocytes are typically about 0.2-1.0 x10^9/L. They mature into macrophages that clear debris and fight infection, so their count rises in chronic infections and during recovery from acute ones.. Reference ranges may vary between laboratories, so always consult your healthcare provider for interpretation.

Helps assess infection, inflammation, and certain blood disorders.

A high monocyte count (monocytosis) is often seen during recovery from an acute infection and in chronic infections such as tuberculosis. It also accompanies chronic inflammatory and autoimmune conditions (such as inflammatory bowel disease). A persistently raised count, particularly in older adults, can indicate a blood disorder such as chronic myelomonocytic leukaemia and is investigated with a blood film.

A low monocyte count (monocytopenia) is less commonly significant. It can occur with acute infection, corticosteroid treatment, and bone marrow suppression from chemotherapy, and is a feature of the rare hairy cell leukaemia. It is usually noted in the context of other low cell lines.

Monocytes are reported in the white cell differential of every full blood count. A transient rise during infection recovery needs no action; a persistent or marked monocytosis is followed up with a blood film and further haematological tests.