White blood cells show how your immune system is reacting and can hint at infection or inflammation.
White blood cells, or leukocytes, are the cells of your immune system. They defend the body against infection, respond to injury, and help control inflammation. There are several types, each with a different job.
The white blood cell count measures the total number in a set volume of blood. It is a core part of the complete blood count and a quick window onto how your immune system is responding.
A white blood cell count helps detect infection, inflammation, and problems with the immune system. A high count (leukocytosis) often signals an infection or inflammation, and sometimes stress or certain medications such as steroids.
A low count (leukopenia) can follow some viral infections, certain medications, or bone marrow problems, and may raise the risk of infection. A differential, which breaks the count into cell types, adds detail about the likely cause.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
Ranges are guidance and vary by laboratory.
| Group | Reference range (SI) |
|---|---|
| Adults | 4.0 to 10.0 x10^9/L |
Aligned to German laboratory practice (DGKL). Always interpret against your own lab's range.
Recent exercise, stress, smoking, and pregnancy can raise the count. Steroids and some other medications shift it. Time of day causes mild variation. Very old or clotted samples can give unreliable results.
Read together with the white cell differential (neutrophils, lymphocytes and others) and inflammation markers such as CRP.
What does my WBC result mean in simple terms? It shows how active your immune system is. Higher or lower counts can reflect infection, inflammation, medicines, or bone marrow activity.
Do I need to fast for a WBC test? No fasting is needed. Drink water and follow any instructions from your clinician.
What can temporarily change my WBC count? Recent illness, hard workouts, stress, smoking, pregnancy, and some medicines (like steroids or lithium) can shift results.
How often should I test WBC? It depends on your symptoms and care plan. Many people test only when unwell or when a clinician is monitoring treatment.
How long do results take? Results are usually ready in about 7 days. Timing may vary with additional tests like a differential.
What should I discuss with my clinician? Share recent infections, exercise, and all medicines or supplements. Ask if you need a WBC differential or a repeat test for confirmation.
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