There are several possible causes for a high white blood cell count. This count is high when there are more disease-fighting cells in your body. The technical term for this condition is leukocytosis.
Different medical practices may have different limits by which they define high white blood cell count. A count of 10,500 leukocytes in one microliter of blood is widely accepted as a high count. The threshold may vary between sex and age.
White blood cells are categorized by five subtypes, and each type has a different activity in fighting disease. When you get the results of your white blood cell count, they will usually specify what the levels are of all the different types. Usually, a high count is only caused by an increase in one type of white blood cells.