Blood types are differentiated according to which of two antigen types (A or B) the blood contains. When blood of one type is introduced into blood of a different type, antibodies (either anti-A anti-B) that are present in the one type but not the other will react with the foreign antigens, resulting in dangerous clumping of the blood.

Which would probably be a dangerous blood transfusion?


Blood type AB contains antibody A, which blood type B does not contain. As a result, antibody A will react against antigen B and will result in dangerous clumping of the blood.

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