How you prepareBy Mayo Clinic staff
If your blood sample is being tested only for a complete blood count, you can eat and drink normally before the test. If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test. Your doctor will give you specific instructions.
- 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.