High white blood cell count is an increase in disease-fighting cells (leukocytes) circulating in your blood. High white blood cell count is also called leukocytosis.

The threshold for high white blood cell count varies from one medical practice to another. A count of more than 11,000 leukocytes in a microliter of blood in adults is generally considered a high white blood cell count. The threshold for a high white blood cell count in children varies with age and size.

Dec. 14, 2012