A patient's antibody screen and autocontrol react at 37 C and the antiglobulin phase with nearly all reagent cells. The DAT is positive with anti-IgG. What is the most important next objective before selecting red cells?
1Assume every reaction represents anti-D and issue D-negative red cells without further testing, even if the patient has been recently transfused with D-positive units
2Use adsorption methods to investigate whether clinically significant alloantibodies are masked by the warm autoantibody✓ 정답
3Report the ABO type as indeterminate without further work and transfuse group O packed cells, regardless of the patient's transfusion history
4Neutralize the serum with soluble A substance only and repeat the antibody screen immediately, ignoring other potential alloantibodies
해설
A broadly reactive warm autoantibody can mask clinically significant alloantibodies. Adsorption and review of transfusion history help separate autoantibody reactivity from underlying alloantibodies before compatible antigen-negative units are selected.