Which ABO/Rh group corresponds to the following serology: Anti-A 4+, Anti-B 4+, Anti-D 0, RhC 0, A1 Cells 0, B cells 0, Dolichos biflorus 0?

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Multiple Choice

Which ABO/Rh group corresponds to the following serology: Anti-A 4+, Anti-B 4+, Anti-D 0, RhC 0, A1 Cells 0, B cells 0, Dolichos biflorus 0?

The main idea is interpreting serology to identify the ABO group, Rh type, and any A1/A2 subtyping clues. Here, forward typing shows strong agglutination with Anti-A and Anti-B, so the red cells express both A and B antigens—this is AB. The absence of a reaction with Anti-D indicates Rh negative. The A1/A2 distinction uses Dolichos biflorus and the anti-A1 test: if Dolichos biflorus is negative, the A antigen present is not A1 (it’s A2). The A1 cells test being negative means there’s no anti-A1 antibody in the serum. Putting this together, the serology describes AB with no D antigen, i.e., AB Rh negative. The other options would require anti-A1 antibodies or D positivity, which are not supported by these results.

The main idea is interpreting serology to identify the ABO group, Rh type, and any A1/A2 subtyping clues. Here, forward typing shows strong agglutination with Anti-A and Anti-B, so the red cells express both A and B antigens—this is AB. The absence of a reaction with Anti-D indicates Rh negative. The A1/A2 distinction uses Dolichos biflorus and the anti-A1 test: if Dolichos biflorus is negative, the A antigen present is not A1 (it’s A2). The A1 cells test being negative means there’s no anti-A1 antibody in the serum. Putting this together, the serology describes AB with no D antigen, i.e., AB Rh negative. The other options would require anti-A1 antibodies or D positivity, which are not supported by these results.

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