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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.
The Rh blood group system (including the Rh factor) is one of thirty-five current human blood group systems. It is the most important blood group system after ABO. At present, the Rh blood group system consists of 50 defined blood-group antigens, among which the five antigens D, C, c, E, and e are the most important.The commonly used terms Rh factor, Rh positive and Rh negative refer to the D antigen only.his term strictly refers only to the most immunogenic D antigen of the Rh blood group system, or the Rhâ blood group system. The status is usually indicated by Rh positive (Rh+ does have the D antigen) or Rh negative (Rhâ does not have the D antigen) suffix to the ABO blood type.