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RH isoimmunization, also referred to as erythroblastosis fetalis is an incompatibility between an infantâs blood and the blood type of the mother.
Rh is short for Rhesus factor. Rhesus factor is a type of antigen present on the surface of red blood cells. If you have have this particular antigen, you are Rh positive. If you donât, youâre Rh negative. The Rh factor is important in determining blood type for transfusions.Normally Your immune system protects against potentially harmful substances (antigens). When foreign antigens enter your body, your immune system makes antibodies to help destroy them.f you donât, youâre Rh negative. The Rh factor is important in determining blood type for transfusions. Normally Your immune system protects against potentially harmful substances (antigens). When foreign antigens enter your body, your immune system makes antibodies to help destroy them.