Which mother-fetus combination is at most risk for a maternal-fetal blood incompatibility?
a. Mother is Rh-positive, and fetus is Rh-negative.
b. Mother is Rh-negative, and fetus is Rh-positive.
c. Mother has type A blood, and fetus has type O blood.
d. Mother has type AB blood, and fetus has type B blood.
ANS: B
Maternal-fetal incompatibility exists if mother and fetus differ in AB and O blood type or if the fetus is Rh-positive and the mother is Rh-negative. Symptoms do not occur in a type O fetus. Symptoms do not occur in type AB mothers.
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