Skip to Content
Human blood is typed according to whether certain markers, called
antigens, are present on the surface of red blood cells. The ABO system
classifies blood as type A, B, AB, or O based on the presence or absence of the
A and B antigens; the Rh system classifies blood as negative or positive based
on the presence or absence of the Rh antigen (Rh factor).
If red blood cells have:
Rh blood typing determines the presence (+) or absence (–) of the
Rh factor. If red blood cells:
Current as of:
October 13, 2016
E. Gregory Thompson, MD - Internal Medicine & Brian Leber, MDCM, FRCPC - Hematology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
© Copyright 2017 Rush Copley Medical Center • 2000 Ogden Avenue; Aurora, IL 60504
Main: 630-978-6200 • Physician Referral & Information: 630-978-6700 or 866-4COPLEY (866-426-7539)