A CBC test measures the quantity and quality of different types of blood cells and other parameters related to blood health. Learn how to perform a CBC test, what are the normal values and ranges, and what abnormal results may indicate. CBC (Complete Blood Count) is a blood test that measures red cells, white cells, platelets, hemoglobin, and more to detect infections, anemia, and disorders. The Complete Blood Count (CBC) is a common blood test that provides information about the cellular components of the blood. The CBC includes measurements of red blood cells (RBCs), white blood cells (WBCs), and platelets, as well as other related indices. A CBC test counts the cells that make up your blood: red blood cells, white blood cells, and platelets. It can help your doctor check for anemia, infection, inflammation, and other health issues.