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White blood cells blood test: what your result means
White blood cell count measures immune cells that help defend the body from infection and inflammation.
- Category
- Complete blood count
- Standard unit
- 10^9/L
- Reported in
- 10^9/L, 10^3/µL, 10^3/mm^3, K/µL, K/mm^3, G/L and more
What does high white blood cells mean?
Higher values may suggest active inflammation, stress response, or infection. What counts as high depends on the reference range printed on your lab report, because ranges differ between laboratories.
What does low white blood cells mean?
Lower values may suggest reduced immune reserve. What counts as low depends on the reference range printed on your lab report, because ranges differ between laboratories.
White blood cells units and conversion
Mediki shows white blood cells in 10^9/L. Labs may report it in other units; Mediki converts them automatically so results from different labs line up on one chart.
10^3/µL, 10^3/mm^3, K/µL, K/mm^3, G/L, Gpt/L are numerically the same as 10^9/L, so no conversion is needed.
| Unit on your report | Convert to 10^9/L | Convert back |
|---|---|---|
| cells/µL, cells/mm^3 | 1 cells/µL = 0.001 10^9/L | 1 10^9/L = 1,000 cells/µL |
| cells/L | 1 cells/L = 1 × 10-9 10^9/L | 1 10^9/L = 1 × 109 cells/L |
Convert a value from your report with the blood test unit converter.
Why track white blood cells over time?
A single white blood cells result is a snapshot. Comparing it with your earlier tests shows whether a value is stable, slowly drifting, or responding to a change in treatment or lifestyle, which is often more useful than one number on its own.
Read our guide on how to read blood test results to understand reference ranges, flags and units.
Track your white blood cells results in one chart
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Medical disclaimer: This page is general information, not medical advice. Reference ranges differ between laboratories, and only a doctor can interpret your results in the context of your health.