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?

• 1 Assume 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
• 2 Use adsorption methods to investigate whether clinically significant alloantibodies are masked by the warm autoantibody ✓ 정답
• 3 Report the ABO type as indeterminate without further work and transfuse group O packed cells, regardless of the patient's transfusion history
• 4 Neutralize the serum with soluble A substance only and repeat the antibody screen immediately, ignoring other potential alloantibodies

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