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What is a normal white blood cell count?


Answers From Experts & Organizations (1)

Internal Medicine
Emory University
131 Answers
108,841 Helpful Votes

Roughly between 4,500 and 10,000 cells per microliter (one one-thousandth of a milliliter).

The white blood cell count is part of a complete blood count (CBC), one of the most common blood tests. Automated cell counting machines count the number of cells present in a blood sample. Different laboratories use different cell counting machines, and each lab may have slightly different values for the normal range.

A high white blood cell count (leukocytosis) is most often due to an infection, but can occur during many different illnesses. Certain medications, such as oral corticosteroids, also increase the white blood cell count.

A low white blood cell count (leukopenia) is less common. Certain medications,  infections, inflammatory and autoimmune conditions, heavy alcohol use, and problems in the bone marrow can cause a low white blood cell count.

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