Alternate Names : Leukocyte count, White blood cell count
4,500-10,000 white blood cells per microliter (mcL).
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What do Abnormal Results Mean?
A low number of WBCs is called leukopenia. It may be due to:
- Bone marrow failure (for example, due to infection, tumor, or abnormal scarring)
- Collagen-vascular diseases (such as lupus erythematosus)
- Disease of the liver or spleen
- Radiation therapy or exposure
A high number of WBCs is called leukocytosis. It may be due to:
- Infectious diseases
- Inflammatory disease (such as rheumatoid arthritis or allergy)
- Severe emotional or physical stress
- Tissue damage (for example, burns)
These lists are not all inclusive.