What is the purpose of performing a 'warm autoantibody screen' in the context of blood transfusion?

A To detect cold agglutinins
B To detect warm autoantibodies ✓
C To detect alloantibodies
D To detect red cell enzymes

Explanation

A warm autoantibody screen is performed to detect the presence of warm autoantibodies, which can cause hemolysis at body temperature.

Source

Technical Manual of the American Association of Blood Banks
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Medium MEDICAL Confidence: high