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WBC Count: White Blood Cell Test Explained

White blood cells (WBCs) are the cells of your immune system that fight infections and diseases. The WBC count measures the total number of these cells in your blood and is a key indicator of immune function, infection, and inflammation.

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Normal Range

4.5 – 11.0 x10³/µL

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Unit

x10³/µL

What Your Results Mean

Normal

A normal WBC count indicates a properly functioning immune system that is not currently fighting a significant infection or experiencing immune suppression.

High

High WBC (leukocytosis) usually indicates infection, inflammation, stress, or in rare cases leukemia. The type of white cell that is elevated helps identify the cause.

Low

Low WBC (leukopenia) suggests the immune system is compromised, which can result from viral infections, chemotherapy, bone marrow disorders, or autoimmune conditions.

Frequently Asked Questions

What is a normal WBC count? expand_more

Normal WBC is 4.5–11.0 x10³/µL. Below 4.5 is low (leukopenia). Above 11.0 is high (leukocytosis).

What causes high white blood cell count? expand_more

Bacterial infections, inflammation, stress, steroid medications, smoking, and in rare cases blood cancers like leukemia.

What causes low white blood cell count? expand_more

Viral infections (HIV, hepatitis), chemotherapy, bone marrow failure, certain medications, autoimmune diseases, and severe nutritional deficiencies.

When should I be concerned about my WBC count? expand_more

A single abnormal result is often not alarming. Persistent elevation or very low levels (below 2.5) warrant further investigation with a differential blood count.

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