°A
classification of blood that is based on the presence or absence of
antigens in the
red blood cells of an individual. For the purposes of
blood transfusion three antigens referred to as "A", "B" and "RhD" (out of a total of 29) are the most important. Based on their presence the human blood can be classified to
A,
AB,
B, and
O blood types which are further divided to
Rh positive or negative.
synonyms:
blood group