Neutropenia
Neutropenia is defined as a decrease in the number of circulating neutrophils (a type of white blood cell) in the blood. Neutrophils are also called polymorphonuclear segmented cells, or segs, or polys, and make up about 60% of the body’s circulating white blood cells. Neutrophils are the white blood cells that respond first to infections or viruses in the body, and are key to maintaining good health (Nirenberg, et al., 2006).