The band cell count test is a blood test to measure the level of band cell count in the blood. A band cell, which is also called band neutrophil is a type of white blood cell. The test is used to confirm bacterial infection and sepsis. An increase in band cell count typically means that the bone marrow has been signalled to increase WBC production owing to an infection or inflammation in the body. The standard values of band cell count may differ for various age groups and gender. It is a simple test often recommended by the physician when they suspect an onset of bacterial infection in the body.