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Neutropenia or neutropaenia, is an abnormally low concentration of neutrophils (a type of white blood cell) in the blood. Neutrophils make up the majority of circulating white blood cells and serve as the primary defense against infections by destroying bacteria, bacterial fragments and immunoglobulin-bound viruses in the blood.
The number of neutrophils cells in the blood is measured by the absolute neutrophil number count. The neutrophils normal range is considered to be between 2500 and 6000. A number of neutrophils lower than the neutrophils normal range also increases the chances of bacterial infections.