A newborn is anemic and jaundiced. The maternal antibody screen contains anti-K, and the newborn's DAT is positive. Which finding best links the maternal antibody to the newborn's red cells?
1A negative maternal autocontrol with normal maternal platelet count and no evidence of hemolysis or thrombocytopenia
2A normal maternal platelet count and negative direct antiglobulin test with no red cell antibodies detected in maternal serum
3Recovery of anti-K from an eluate prepared from the newborn's red cells✓ 정답
4An increased maternal fibrinogen and prolonged prothrombin time with elevated D-dimer, consistent with disseminated intravascular coagulation
해설
Elution removes antibody bound to the newborn's red cells. Demonstrating the same specificity in the eluate as in maternal plasma supports antibody-mediated hemolytic disease.