alleryStart learning →Without preventive treatment, in about what percentage of such pregnancies is an Rh negative mother exposed to fetal Rh positive cells?
AAbout 13 to 14 percent
BAbout 1 to 2 percent
CAbout 30 to 35 percent
DAbout 85 percent
Answer & Solution
Correct answer: A. About 13 to 14 percent
1. During or immediately after birth, an Rh negative mother can be exposed to the Rh positive cells of her baby.
2. Research has shown this occurs in about 13 to 14 percent of such pregnancies.
3. That figure is also the incidence of hemolytic disease of the newborn in a subsequent Rh positive pregnancy without preventive treatment.
4. About 85 percent is the prevalence of the Rh D antigen in the population and has nothing to do with exposure rate, which makes it the number most likely to be misplaced here.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.6 Blood Typing_
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