What it is: A monocyte count measures the number of monocytes, a type of white blood cell that cleans up cell debris and alerts other immune cells to threats, typically as part of a CBC with differential.
Why it's ordered: Ordered alongside a CBC with differential to help evaluate chronic infections, inflammatory conditions, or certain blood disorders.
What it detects: Monocytes mature into macrophages that clear damaged cells and pathogens. Elevated counts (monocytosis) can reflect chronic infection, inflammation, or certain blood cancers; low counts (monocytopenia) are less common and can reflect bone marrow suppression.
Collection & prep: A standard blood draw from a vein in the arm, as part of a CBC with differential. No special preparation is needed.
Results:
High – can reflect chronic infection, inflammation, or certain blood disorders
Normal – typically 2–8% of total white blood cells
Possible complications: Monocyte and basophil counts are technically the hardest white cell types to count precisely, so isolated mild abnormalities are often re-checked or interpreted alongside the full differential rather than acted on individually.
Statements made in the Clinical Manual have not been evaluated by the FDA. The products mentioned are not intended to diagnose, treat, cure or prevent any disease.
