Detection of blood groups is done by agglutinisation test using antiserum. According to this method, if the blood shows coagulation with
antiserum B, blood group is AB.
antiserum B, blood group is B.
antiserum A and B, blood group is O.
antiserum A, blood group is O.
As we learned
Agglutination -
Agglutinogeus (Antigens) are present on the surface of RBCs and agglutins (antibody) are found in the blood plasma. When similar kind of antigen and antibody come together they form clump, called agglutination.
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