what is a cbc blood screening
Definition. A complete blood count (CBC) is a blood test used to evaluate your overall health and detect a wide range of disorders, including anemia, infection and leukemia. A complete blood count test measures several components and features of your blood, including:1  Red blood cells, which carry oxygen.efinition. A complete blood count (CBC) is a blood test used to evaluate your overall health and detect a wide range of disorders, including anemia, infection and leukemia. A complete blood count test measures several components and features of your blood, including: 1  Red blood cells, which carry oxygen. 2  White blood cells, which fight infection.