What you can expect

The blood sample is generally drawn with a needle from a vein in your arm. You may feel some tenderness at the site, but you'll be able to resume normal activities afterward.

May 26, 2016
References
  1. Sandoval C. Approach to the child with anemia. http://www.uptodate.com/home. Accessed March 24, 2016.
  2. Schrier SL. Approach to the adult patient with anemia. http://www.uptodate.com/home. Accessed March 24, 2016.
  3. Types of blood tests. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/health-topics/topics/bdt/types. Accessed March 24, 2016.
  4. Tefferi A. Diagnostic approach to the patient with polycythemia. http://www.uptodate.com/home. Accessed March 24, 2016.
  5. Hoffman R, et al. The polycythemias. In: Hematology: Basic Principles and Practice. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2013. http://www.clinicalkey.com. Accessed March 24, 2016.
  6. CBC with differential, blood. Mayo Medical Laboratories. http://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/9109. Accessed March 24, 2016.