A. If there was no reaction (or clumping), then the blood type is known to be type B, as there is no antibody b in the serum to react with the B antigens
B. If the red blood cells clump, then the sample is A, because type A blood serum contains antibody b, which reacts with type B antigen.
C. If the sample reacts with the serum forming a clump, then the sample contains antigen A. The sample is either type A or AB, and it is necessary to test the sample further.
D. If there is a reaction or clumping, the sample is type O, as the serum of this sample will contain the antibody b
E. If there is no reaction (or clumping), then the sample is type AB.
F. If no clumping occurs, then the sample is either type O or B and further testing must be done.
1. The student tested all the unknown red blood cells with the serum from the type B blood, which contains the antibody a, which reacts with antigen A.
2. The serum from the samples which tested positive for antigen A are tested with the type B red blood cells.
3. The serum from the samples that did not contain the A antigen were tested with the type B red blood cell sample.
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