胎儿从父亲和母亲各接受一半基因成分 ,因此可能与其母亲有不同的血型而发生母儿血型不合。缺乏某种胎儿血型抗原的母体被该抗原致敏后产生相应的抗体 ,母亲的有些血型特异性抗体有透过胎盘的能力 ,然后进入胎儿血液循环 ,与胎儿红细胞发生免疫反应 ,使红细胞凝集破坏 ,引起胎 The fetus receives half of the genetic components from both the father and mother and therefore may have different blood types from their mothers and maternal and child type incompatibility. Lack of some fetal blood group antigen by the antigen sensitized to produce the corresponding antibodies, some of the mother’s blood group-specific antibodies have the ability to penetrate the placenta, and then into the fetus blood circulation, and fetal red blood cell immune response, agglutination of erythrocyte damage , Causing the fetus