Neutrophils.band form

Band form neutrophils (bands) are immature white blood cells released from the bone marrow into the bloodstream in response to acute infection or inflammation. An elevated band count, known as a "left shift," is a hallmark of bacterial infection and sepsis. Bands are counted as part of the manual differential on a complete blood count (CBC). Their presence signals the body's urgent demand for neutrophils and is one of the SIRS criteria used in critical care. Monitoring band counts helps track infection severity and response to antibiotic therapy.