IMPC_HEM_038_001 A white blood cell (WBC) count measures the number of white blood cells in your blood. A WBC differential determines the percentage of each type of white blood cell present in your blood. A differential can also detect immature white blood cells or any abnormalities, both of which are signs of a potential problem. false false false FLOAT false false Basophil differential count % false false true 1.0 false simpleParameter