All of the following mothers have recently given birth. Which newborn is most likely to have erythroblastosis fetalis?
a. An Rh+ mother has an Rh+ baby.
b. An Rh+ mother has an Rh– baby.
c. An Rh– mother has an Rh– baby.
d. An Rh– mother has an Rh+ baby.
ANS: D
When an Rh-negative mother is carrying an Rh-positive fetus, the mother makes antibodies against the Rh-positive red blood cells. The maternal antibodies enter the fetal circulation and destroy the fetal red blood cells.
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