Clarilab

Blood count

White blood cells test

Also called WBC, TLC, total leucocyte count

The cells that fight infection.

Typical range
4,000–11,000 per µL (4–11 × 10³/µL).
Usual recheck
About 1 month when out of range

Why it's done

Part of the CBC. Helps tell whether a fever is likely infection or inflammation.

What a high result can mean

Usually infection or inflammation; also stress, steroids or smoking. Very high counts need prompt follow-up.

What a low result can mean

Viral infections (including dengue), some medicines, or bone marrow problems.

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More blood count tests

Complete blood count (CBC)Counts your red cells, white cells and platelets, and measures haemoglobin. HemoglobinThe protein in red blood cells that carries oxygen. PlateletsCell fragments that help blood clot. Red blood cellsThe number of oxygen-carrying red cells. Hematocrit (HCT/PCV)The share of your blood made up of red cells. MCVThe average size of your red cells.