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SummaryBackground: The role of humoral immunity in the pathogenesis of PET is well known so that an altered immune response could be the cause of this disease . Objectives: to evaluate the rule ofplacenta _ bound IgG in the pathogenesis of PET. Methods: 31 pregnant women were included in this study delivered by cesarean section at Baghdad Teaching Hospital , 16 of them were diagnosed and treated for PET. while the rest 15 cases were of normal women of using direct immunoflorescnt test, the level of IgG was detected.Result: Tthe study showed a significant higher level of IgG in the placental biopsy of PET cases than those of control group using ttest, (P<0.025),Conclusion: Trophoblastic bound IgG plays an important role in the pathogenesis of PET as a part of altered humoral immune response against placental tissue in those patients.Key words: PET: preeclampsia, IgG: immunoglobuline. BP: blood pressure

PET: preeclampsia --- IgG: immunoglobuline. BP: blood pressure.