White Blood Cells (WBC)
Immune cells that defend the body against infection and disease. An elevated count usually signals infection or inflammation.
Typical normal range
4,500–11,000 cells/µL
If high ↑
Infection, inflammation, leukemia, stress, steroid use
If low ↓
Viral illness, bone marrow problems, autoimmune disorders, chemotherapy
What is a normal White Blood Cells level?
A typical reference range is 4,500–11,000 cells/µL. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high White Blood Cells level mean?
Infection, inflammation, leukemia, stress, steroid use. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low White Blood Cells level mean?
Viral illness, bone marrow problems, autoimmune disorders, chemotherapy. Your doctor will interpret it alongside your symptoms and other tests.
About the Complete Blood Count (CBC)
A complete blood count looks at the cells in your blood: red cells that carry oxygen, white cells that fight infection, and platelets that help blood clot. It is one of the most commonly ordered tests and is often part of a routine check-up.
See your own White Blood Cells result explained
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Analyze my results freeRelated markers in the Complete Blood Count (CBC)
Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.