Complete Blood Count (CBC) is a test that catalogs all the components of human blood. A count of each type of blood cell is reported, along with calculations of cell qualities and quantities that have been shown to be clinically useful. A specialized machine most often performs this count.

An additional study often requested with CBC is a differential. The differential further reports the percentage of each type of white blood cell.

CBC is useful in diagnosis of a wide variety of diseases, as well as an indicator of general health. CBC is most often used in spine care to screen for infection, indication of occult bleeding, or bleeding diatheses.