Ten Days After a 2-Unit RBC Transfusion,a Patient Experienced a 2

Multiple Choice

Ten days after a 2-unit RBC transfusion,a patient experienced a 2 g/dL drop in hemoglobin and appeared slightly jaundiced.No evidence of bleeding was observed.What tests would be helpful in determining whether the patient is experiencing a delayed hemolytic transfusion reaction?

A) Culture the donor unit.
B) Compare pretransfusion and posttransfusion ABO and D typing.
C) Perform hepatitis B surface antigen test.
D) Perform an antibody screen and DAT on the current posttransfusion sample.