How you prepare

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.

Aug. 09, 2017
References
  1. Complete blood count. Lab Tests Online. https://labtestsonline.org/understanding/analytes/cbc/tab/test. Accessed Aug. 29, 2016.
  2. CBC with differential, blood. Mayo Medical Laboratories. http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/9109. Accessed Aug. 29, 2016.
  3. Understanding blood counts. Leukemia and Lymphoma Society. http://www.lls.org/managingyourcancer/labandimagingtests/understandingbloodcounts. Accessed Aug. 29, 2016.