Posters P0594-P0704 - Prenatal and Perinatal Genetics 594. Fetal cells in maternal blood as a screening test for fetal aneuploidies A. Mavrou , A. Kolialexi , A. Antsaklis , A. Koratzis , C. Metaxotou Medical Genetics Athens University School of Medicine; Athens, Greece; Medical Genetics, Athens University, School of Medicine; Athens, Greece; Medical Genetics, Athens University school of Medicine; Athens, Greece ariamav@hol.gr Anti hemoglobin chain antibody has been used to detect fetal nucleated red blood cells (NRBCs) entering maternal circulation during pregnancy. In a previous study we demonstrated, however, that women carriers of -thalassemia produce themselves during pregnancy an increased number of + NRBC making it difficult to distinguish between fetal and maternal NRBCs. Use of Ab against embryonic hemoglobin may increase specificity for fetal NRBCs. In the present study NRBCs were isolated by MACS from 20ml peripheral blood of 50 pregnant women carriers of thalassemia trait, 27 in the first and 23 in the second trimester of pregnancy. NRBCs were next identified immunocytochemically using anti or anti monoclonal antibodies (MoAb). FISH was performed in 22 cases known to carry male fetuses with X/Y chromosome specific probes. The mean number of NRBCs isolated with anti | |
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