38+ Blood Type Ab And O Compatibility For Pregnancy Background. While the former is a universal receiver, the latter is a universal donor. Research shows that compatibility is limited to possible rh factor differences during pregnancy.

These people have both a and b antigens.

Blood types are categorized by a, b, and o, and given an the mother is type b and their baby is a or ab. Compatibility of blood type is necessary before transfusing blood in times of accidents and emergencies. Everybody has a blood type and there are four major blood groups: Type ab, on the other hand, since it has both a and b antigens and also does not create antibodies for either antigen, can receive blood from all four.