Educational information only. At Precursor, blood testing is requested and reviewed by a clinician and considered alongside your history and other markers, not as a stand-alone diagnosis. Testing is performed in NATA-accredited laboratories to ISO 15189 standards.

What is the white blood cell count?

The white blood cell count measures the total number of immune cells in your blood. These cells are your body's defence force, and their overall number rises and falls in response to infection, inflammation, stress and other demands on the immune system.

Why it matters

The total white cell count is a broad first look at immune activity. It is most powerful when broken into its different cell types, the differential, because the pattern between them offers clues about whether the body is fighting an infection, dealing with inflammation, or something else.

What your results can mean

If your result is higher

A raised white cell count often reflects the body responding to infection or inflammation, and can also rise temporarily with stress. The differential helps show which type of cell is driving it.

If your result is lower

A low white cell count can follow certain infections or medications, and is interpreted in the context of your history and the rest of the count.

Australian reporting and interpretation

White cell count is reported as ×10⁹/L. Adult reference intervals are laboratory specific, and age has a substantial effect in children. Use the range printed on your own report and interpret the count with the white cell differential and your clinical context.

Test your blood count with Precursor

The white cell count is most informative with its full differential. At Precursor it is measured as part of Full Advanced Bloods, a single clinician-reviewed blood draw covering your full blood count, heart, metabolic, hormonal, kidney, liver, thyroid and nutrient markers together, giving you and your clinician a broad baseline to understand and track.