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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: September 23, 2020
E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Brian Leber MDCM, FRCPC - Hematology
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