Leucocytosis is an increase in the number of white blood cells in the blood. It is a common feature of inflammatory reactions, particularly those caused by bacteria. The type of leucocyte increasing in number is dependent on the stimulus type and chronicity; subtypes include:
The level of leukocytosis is an insensitive guide to the severity of established infection. Typical values are:
Leukocytosis should be contrasted with leukopenia.
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