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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.
Exchange transfusion, in which blood is removed from a person and simultaneously replaced by donor blood, is used mainly in treating erythroblastosis fetalis. Intrauterine or Fetal Transfusion. Intrauterine transfusion involves direct transfusion of Rh negative packed red blood cells into the fetal peritoneal cavity.It is done for the early treatment of pronounced degrees of fetal isoimmunization before weeks 32 to 34 of pregnancy. The first step is injection of a radiopaque dye into the amniotic fluid.ntrauterine or Fetal Transfusion. Intrauterine transfusion involves direct transfusion of Rh negative packed red blood cells into the fetal peritoneal cavity.