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Review Of Related Disease (RRD) 4 Practice Exam

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In blood type B, which antigen is present on RBCs and which antibody is present in plasma that would react with type A blood?
Correct Answer:
B antigen; anti-A antibodies
Explanation:
The main idea is how ABO blood types are defined by surface antigens on red blood cells and the antibodies in plasma. In type B blood, red cells carry the B antigen, and the plasma has antibodies against the A antigen. If these cells encounter type A blood, the anti-A antibodies in the plasma recognize the A antigen on the donor red cells and bind to them, causing agglutination and potential hemolysis. This is why the combination described is B antigen on red cells with anti-A antibodies in the plasma.

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