The number of people in the general population with type AB blood is relatively small. That is fortunate because these people make the least useful donors. Why are these people not as useful as other blood donors?
What will be an ideal response?
A person who is AB has both the A and B antigens. The blood is not useful for someone who is type A because the B antigen will cause problems. Also, the blood is not useful for someone who is type B because the A antigen will cause problems. Of course, someone with type O blood would reject both the A and B antigens. Type AB blood is useful only for type AB patients.
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