A newborn requires an exchange transfusion for hemolytic disease caused by maternal anti-D. Which red cell unit is most appropriate?
1Group O, D negative, compatible with the maternal serum✓ 정답
2Group O, D positive, crossmatch compatible with the infant
3Group specific to the infant, D positive
4Group AB, D negative
해설
The maternal anti-D is what destroys the red cells of the infant, so the unit must be D negative and compatible with the maternal serum. In neonatal testing the serum of the mother is the source of antibody, so compatibility is assessed against the maternal sample.