What is a band neutrophil?

A band neutrophil refers to an immature form of a neutrophil, which is a type of white blood cell that plays a critical role in the immune response. Specifically, band neutrophils are the precursors to segmented neutrophils, which are the mature form.

During a response to infection or inflammation, the bone marrow releases these immature cells into the bloodstream. They are characterized by their horseshoe-shaped nucleus, which has not yet segmented into the distinct lobes seen in fully mature neutrophils. The presence of band neutrophils in a blood sample can indicate that the body is actively fighting an infection or dealing with a significant inflammatory process, where the demand for neutrophils has outstripped the supply of mature ones, prompting the release of these immature cells.

This detail about the band neutrophil's role in the immune response and its identification by the shape of its nucleus are key aspects to understand for preparing for the Veterinary Technician National Exam.