A patient with marked hyperproteinemia shows unexpected weak reactions with both reagent reverse-grouping cells. Microscopy suggests rouleaux. Which technique best tests whether the reactions are caused by excess plasma protein?

• 1 Report the patient as group AB immediately without further workup, assuming the weak reactions are true and the discrepancy is due to a technical error
• 2 Add more patient plasma to the test without changing the cell ratio, then recheck for rouleaux under the microscope
• 3 Replace the patient's plasma with saline after centrifugation and repeat the reverse-grouping reactions ✓ 정답
• 4 Incubate the test at 56°C for one hour to inactivate cold-reactive antibodies that may be causing the weak reactions

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