A transfusion patient with anti-P1 would require approximately how many compatible units?

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Multiple Choice

A transfusion patient with anti-P1 would require approximately how many compatible units?

Explanation:
Anti-P1 targets the P1 antigen on red cells. To avoid a reaction, transfused cells must be P1-negative. In the donor population, about 20–25% lack the P1 antigen, so only roughly a quarter of donor units would be compatible. Therefore, a patient with anti-P1 would typically require P1-negative units, meaning about one compatible unit for every four units transfused.

Anti-P1 targets the P1 antigen on red cells. To avoid a reaction, transfused cells must be P1-negative. In the donor population, about 20–25% lack the P1 antigen, so only roughly a quarter of donor units would be compatible. Therefore, a patient with anti-P1 would typically require P1-negative units, meaning about one compatible unit for every four units transfused.

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