The most common blood tests are complete blood counts, blood chemistry tests, blood enzyme tests and heart disease screening blood tests, according to the National Heart, Lung and Blood Institute.
A complete blood count is usually part of a routine checkup. A CBC detects anemia, blood cancers, immune system disorders and infections, states the National Heart, Lung and Blood Institute. This blood test measures red blood cells, white blood cells, hemoglobin, hematocrit and platelets. Abnormal results can be an indicator of a medical condition requiring treatment, according to Mayo Clinic.
Blood chemistry tests measure a variety of chemicals found in blood. This test is used to give an overview of overall metabolism and chemical balance. The blood chemistry test shows kidney and liver function, blood glucose levels, protein levels and electrolytes within the body, says MedlinePlus.