alleryStart learning →About what percentage of Americans carry the Rh D antigen on their erythrocytes?
AAbout 50 percent
BAbout 85 percent
CAbout 15 percent
DAbout 99 percent
Answer & Solution
Correct answer: B. About 85 percent
1. Dozens of Rh antigens exist, but only the one designated D is clinically important.
2. Those who carry the Rh D antigen are described as Rh positive.
3. About 85 percent of Americans fall into that group.
4. The remaining 15 percent lack it and are Rh negative, so that figure is the complement and the built-in trap.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.6 Blood Typing_
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