What percentage of donor blood is compatible with a patient who has anti-Jk^a?

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Multiple Choice

What percentage of donor blood is compatible with a patient who has anti-Jk^a?

Explanation:
Anti-Jka reacts with the Jk^a antigen on red cells, so a donor unit is compatible only if it lacks that antigen (Jk(a-)). In most populations, about one quarter of donors are Jk(a-), meaning roughly a quarter of donor blood would be compatible for a patient with anti-Jk^a. This frequency can vary by ethnicity, but the general idea is that compatibility requires antigen absence, making the compatible proportion around 25%.

Anti-Jka reacts with the Jk^a antigen on red cells, so a donor unit is compatible only if it lacks that antigen (Jk(a-)). In most populations, about one quarter of donors are Jk(a-), meaning roughly a quarter of donor blood would be compatible for a patient with anti-Jk^a. This frequency can vary by ethnicity, but the general idea is that compatibility requires antigen absence, making the compatible proportion around 25%.

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