Can a blood transfusion change your blood type?
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The genes don't change. However, people noticed that after bone marrow transplants, recovered patients sometimes slowly developed their donor's blood types. The marrow was used making one kind of blood, and it would continue, slowly filling people with cells that didn't match their genotype.
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Studies have shown that donor DNA in blood transfusion recipients persists for a number of days, sometimes longer, but its presence is unlikely to alter genetic tests significantly. Red blood cells, the primary component in transfusions, have no nucleus and no DNA.
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