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WBC differential

A blood test that counts the five types of white blood cells and gives each as a percentage of the total.

dub-ul-yoo-bee-see dif-er-EN-shul noun

What it means

Part of a complete blood count. The five types are neutrophils (which fight bacteria), lymphocytes (viruses and immune memory), monocytes, eosinophils (allergy and parasites) and basophils. Each pattern points in a direction: many young neutrophils called bands (a "shift to the left") suggests a bacterial infection, for example. The absolute neutrophil countAB-suh-loot NOO-truh-fil kowntThe number of neutrophils, the white blood cells that fight bacterial infection, in a set amount of blood.Full entry is worked out from it.

At a glance

Normal rangeNeutrophils about 55–70%; lymphocytes 20–40%; monocytes 2–8%; eosinophils 1–4%; basophils 0.5–1%. Ranges vary by lab.
Also writtendifferential count, white blood cell differential, WBC diff

Related terms

neutrophil

The most common type of white blood cell, which is first to reach and destroy bacteria at a site of infection.

lymphocyte

A type of white blood cell that targets specific germs and abnormal cells, including T cells, B cells and natural killer cells.

absolute neutrophil count

The number of neutrophils, the white blood cells that fight bacterial infection, in a set amount of blood.

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