White Blood Cell Count (WBC)
- Sample Type
- Standard
- Fasting
- No
- Unit
- 10^9/L
The WBC count measures the total number of leukocytes in the blood and is a primary marker for infection, inflammation, and bone marrow function. Within a Complete Blood Picture, it serves as the 'first responder' indicator. High counts suggest the body is fighting an invader or reacting to tissue damage, while low counts suggest a vulnerability to infection or a failure in the production 'factory' (bone marrow).
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
WBC counts fluctuate significantly throughout the day. Factors like smoking, third-trimester pregnancy, and emotional stress can cause 'physiologic' leukocytosis. Conversely, many common medications (antibiotics, anticonvulsants) can cause mild leukopenia that doesn't necessarily indicate disease.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for White Blood Cell Count (WBC):
Official Sources
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
Get Notified When Dr. Babu Is Available