Which of the following best lists warm reacting antibodies?

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Multiple Choice

Which of the following best lists warm reacting antibodies?

Warm reacting antibodies are those that recognize antigens best at body temperature (37°C) and are usually of the IgG class. Because they react at 37°C and are detected with the antiglobulin (AHG) phase, they are the ones most likely to cause clinically significant hemolysis during transfusion. The most common and important warm-reacting alloantibodies fall in the Rh, Kidd, Kell, Duffy, and MNS (S and s) systems. Antibodies against these antigens tend to be IgG, show dosage, and persist, making them relevant for transfusion planning and crossmatching. In contrast, many antibodies against ABO and H are IgM and react best at room or colder temperatures, not at 37°C, so they are not considered warm-reacting. Similarly, Lewis, I, P, and M antibodies are typically cold-reactive or IgM, so they don’t fit the warm-reacting profile.

Warm reacting antibodies are those that recognize antigens best at body temperature (37°C) and are usually of the IgG class. Because they react at 37°C and are detected with the antiglobulin (AHG) phase, they are the ones most likely to cause clinically significant hemolysis during transfusion. The most common and important warm-reacting alloantibodies fall in the Rh, Kidd, Kell, Duffy, and MNS (S and s) systems. Antibodies against these antigens tend to be IgG, show dosage, and persist, making them relevant for transfusion planning and crossmatching.

In contrast, many antibodies against ABO and H are IgM and react best at room or colder temperatures, not at 37°C, so they are not considered warm-reacting. Similarly, Lewis, I, P, and M antibodies are typically cold-reactive or IgM, so they don’t fit the warm-reacting profile.

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