alleryStart learning →How many antigens have been identified on erythrocyte membranes?
AMore than 50
BExactly two
CAbout 400
DAbout 13
Answer & Solution
Correct answer: A. More than 50
1. More than 50 antigens have been identified on erythrocyte membranes.
2. Only two groups matter most for patient harm, the ABO group and the Rh group.
3. Exactly two would confuse the number of clinically important groups with the number of antigens known.
4. Dozens of Rh antigens alone have been identified, which already rules out any answer as low as two.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.6 Blood Typing_
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