The most likely cause of immediate hemolytic transfusion reaction is from antibodies of which system?

Question

Quizplus · Accepted Answer

ABO antibodies are naturally occurring antibodies that can react immediately with ABO incompatible red blood cells, leading to hemolysis and a transfusion reaction. The other systems listed may cause delayed hemolytic transfusion reactions or other complications, but are less likely to cause an immediate reaction.

The Most Likely Cause of Immediate Hemolytic Transfusion Reaction Is