An individual has anti-A1 antibody; to which ABO subgroup is this most commonly associated?

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Multiple Choice

An individual has anti-A1 antibody; to which ABO subgroup is this most commonly associated?

The important idea is that the A blood group has subtypes, mainly A1 and A2. Anti-A1 antibodies target the A1 antigen, which is present on cells of the A1 subgroup but not on A2 cells. Some individuals with the A2 phenotype naturally develop anti-A1 antibodies. Because their red cells lack the A1 antigen, these antibodies react with A1 cells but not with A2 cells. That’s why anti-A1 antibodies are most commonly associated with the A2 subgroup. In transfusion terms, this means A2 (and often A2B) donor cells can be used safely for someone with anti-A1, whereas A1 cells could provoke a reaction.

The important idea is that the A blood group has subtypes, mainly A1 and A2. Anti-A1 antibodies target the A1 antigen, which is present on cells of the A1 subgroup but not on A2 cells. Some individuals with the A2 phenotype naturally develop anti-A1 antibodies. Because their red cells lack the A1 antigen, these antibodies react with A1 cells but not with A2 cells. That’s why anti-A1 antibodies are most commonly associated with the A2 subgroup. In transfusion terms, this means A2 (and often A2B) donor cells can be used safely for someone with anti-A1, whereas A1 cells could provoke a reaction.

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