A pretransfusion antibody screen is positive with both screening cells, but the patient's autocontrol is negative. What is the most appropriate next laboratory action?

• 1 Report the screen as negative because the autocontrol is negative
• 2 Issue uncrossmatched group O red cells for all future transfusions
• 3 Perform antibody identification and select antigen-negative, crossmatch-compatible red cells when indicated ✓ 정답
• 4 Repeat only the ABO forward type using a different anti-A reagent

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