RESUMO
Objective To establish the FCM method of non invasive detection of fetal ABO and Rh(D) blood groups in maternal blood.Methods Using absorption and elution method, we obtained the IgG anti A and anti B from human sera. The IgG anti A, B, D were used as the first antibody to react with RBCs in maternal peripheral blood.The goat anti human IgG F(ab')2 FITC was used as the second antibody to conjugate anti A, B, D antibodies, Meanwhile anti i PE was used to mark fetal RBCs in maternal peripheral blood.The fluorescence dot plot diagrams of maternal and fetal cells acquired by FCM were used to detect fetal ABO and Rh(D) blood groups.Results Peripheral blood from 69 pregnant women between 8 and 39 weeks of gestation were studied.Fetal cells could not be found in 13 samples.Of the remaining 56 samples,fetal red cells were identified successfully with ABO/Rh(D) blood types identical to those tested after the birth of the baby.Conclusion In women with fetomaternal hemorrhage(FMH) during pregnancy,the FCM method established by the author can accurately and non invasively detect the blood groups of fetuses.This method can possibly be used for diagnosis of hemolytic disease of the newborn.