A test to check the number of red blood cells, white blood cells, and platelets in a sample of blood. Also called blood cell count and complete blood count.
Complete blood count (CBC). Blood is collected by inserting a needle into a vein and allowing the blood to flow into a tube. The blood sample is sent to the laboratory and the red blood cells, white blood cells, and platelets are counted. The CBC is used to test for, diagnose, and monitor many different conditions.