DefinitionBy Mayo Clinic Staff
A high white blood cell count is an increase in disease-fighting cells in your blood.
The exact threshold for a high white blood cell count varies from one laboratory to another. In general, for adults a count of more than 11,000 white blood cells (leukocytes) in a microliter of blood is considered a high white blood cell count.
A high white blood cell count is also called leukocytosis.
Dec. 17, 2015
- Cerny J, et al. Why does my patient have leukocytosis? Hematology Oncology Clinics of North America. 2012;26:303.
- McPherson RA, et al. Leukocytic disorders. In: Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa.: Saunders Elsevier; 2011. Accessed Oct. 6, 2015.