WBC Count
WBC
- Sample
- Blood
- Usual units
- thousand/µL
Also known as WBC · Total WBC Count · TLC · Total Leucocyte Count · Total Leukocyte Count · White Blood Cell Count · Leucocyte Count
What this test measures
The WBC count is the number of white blood cells in a volume of blood. White blood cells participate in the body's immune response, and the count is commonly reported as thousands of cells per microliter.
Reading your report
There isn’t one standard range for this test — each lab prints its own. Use the range shown next to your result.
WBC Count unit converter
Convert WBC Count units
Labs print this test in /µL or thousand/µL depending on where the sample was run.
Related guides
- Guide
Why the same blood test has different "normal" ranges at different labs
Reference intervals are built from each lab's own population and equipment, which is why two labs can print different ranges for the same sample.
- Guide
Reference interval, cutoff, and the "optimal" numbers online: three different things
The range beside your result, the target a website quotes, and the threshold that defines a condition are built in different ways and answer different questions.
- Guide
Why the same lab printed a different reference range for you this year
Ranges are not fixed constants. The lab can change method, revise its reference group, or apply a range that depends on your age — none of which is an error.
- Guide
The differential: why white cells are printed as both a percentage and a count
Five types of white blood cell, each reported twice — once as a share of the total and once as an absolute number. Why both columns exist and why they can disagree.