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Blood type - OBGYN Associates
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Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Blood type

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:

  • The A antigen, they are type A blood.
  • The B antigen, they are type B blood.
  • Both the A and B antigens, they are type AB blood.
  • Neither A nor B antigens, they are type O blood.

Rh blood typing determines the presence (+) or absence (–) of the Rh factor. If red blood cells:

  • Have the Rh antigen, they are Rh-positive.
  • Do not have the Rh antigen, they are Rh-negative.

Current as of: December 13, 2023

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.