Complete Blood Count (CBC)
White Blood Cell Count (WBC)
White blood cells (leukocytes) are part of your immune system. They flow through your blood to battle viruses, bacteria, and other foreign invaders.
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Information verified for medical accuracy
Why is it tested?
To diagnose infections, inflammatory diseases, autoimmune conditions, or leukemia.
What does a HIGH level mean?
- Infection (bacterial or viral)
- Inflammation
- Severe stress
- Leukemia or immune system disorders
What does a LOW level mean?
- Viral infections that temporarily disrupt bone marrow
- Autoimmune disorders
- Severe infections (sepsis)
- Chemotherapy
Normal Reference Range
4,500 to 11,000 cells per microliter (mcL)
*Ranges may vary slightly depending on the specific laboratory and testing methods used.
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