DefinitionBy Mayo Clinic staff
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:
- Red blood cells, which carry oxygen
- White blood cells, which fight infection
- Hemoglobin, the oxygen-carrying protein in red blood cells
- Hematocrit, the proportion of red blood cells to the fluid component, or plasma, in your blood
- Platelets, which help with blood clotting
Abnormal increases or decreases in cell counts as revealed in a complete blood count may indicate that you have an underlying medical condition that calls for further evaluation.
- Nicoll D, et al. Complete blood cell count. In: Nicoll D, et al. Pocket Guide to Diagnostic Tests. 5th ed. New York, N.Y.: McGraw-Hill Companies, Inc.; 2008. http://www.accessmedicine.com/popup.aspx?aID=3135998. Accessed Dec. 10, 2010
- Complete blood count. Lab Tests Online. http://labtestsonline.org/understanding/analytes/cbc/test.html. Accessed Dec. 10, 2010.
- Fischbach FT. Blood studies: Hematology and coagulation. In: Fischbach FT. A Manual of Laboratory and Diagnostic Tests. 8th ed. Philadelphia, Pa.: Lippincott Williams & Wilkins; 2009:58.
- Laboratory reference values. Hematology group. Rochester, Minn.: Mayo Foundation for Medical Education and Research; December 2010.
- Mesa RA (expert opinion). Mayo Clinic, Phoenix/Scottsdale, Ariz. Dec. 10, 2010.