scope:

These recommendations cover performance testing of leukocyte (WBC) differential counting. Only those WBC found in normal (nondiseased) individuals will be addressed. These cell types are: neutrophils (segmented), neutrophils (band forms), lymphocytes (normal), lymphocytes (variant forms), monocytes, eosinophils, and basophils. If not identified, the system should appropriately flag other cells as abnormal, suspect or unclassified, or as nucleated red blood cells (NRBC).

Some devices may group several cell types into a single category. For example, segmented and band neutrophils, eosinophils, and basophils may be combined as granulocytes