The nurse should be alert to a blood group incompatibility if:
a. both mother and infant are O-positive.
b. mother is A-positive and infant is A-negative.
c. mother is O-positive and infant is B-negative.
d. mother is B-positive and infant is O-negative.
ANS: D
Blood group incompatibilities occur because O-positive mothers have natural antibodies to type A or B blood. When mother and infant both have blood group O or A, no incompatibility exists. The mother with blood group B does not have any antibodies to group O.
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