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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.
Overview. Neutrophilia refers to a higher than normal number of neutrophils. Neutrophilia may result from a shift of cells from the marginal to the circulating pool (shift neutrophilia) without an increase in the total blood granulocyte pool (TBGP) or from a true increase in TBGP size (true neutrophilia).n addition to many components common to all cells, approximately 45% of the neutrophil cytosolic protein is composed of migration inhibitory factorârelated proteins (MRPs), such as MRP-8 and MRP-14. Neutrophils contain a large amount of glycogen in the cytoplasm.