Why does the O blood group have both groups of antibodies?

Blood[1] is connective tissue which are classified into four groups namely, Group A, Group B, Group AB and Group O. The blood group[2] A consists of antigen A and antibodies B present in them. The blood group B consists of antigen B and antibodies A present in them. read more

People with blood group O can only receive RBCs of blood group O, because they carry both antibodies. Blood group A can receive A and O, and blood group B can recive B and O. Hence, blood group O can be received by all other groups, and is therefore the universal donor. read more

Ask New Question Pippi M. R. Groving, My field is Biomedicine: study of diseases at the molecular and cellular levels. read more

Yes the blood plasma of O blood group have some antibodies against A and B antigen, but in emergency situations that can be neglected, although it's always more practical to transfuse the blood of the same group. read more