[The prenatal cytogenetic diagnosis of fetal chromosomal pathology in women in a high-risk group].

The results of investigation of 908 chorion and placental biopsy in 873 pregnant women of high risk a group is presented. Fetal pathology was diagnosed with the help of "direct" method and shot-term method of culture of chorionic villi and placenta, as well as method of long-term fetal lymphocyte cultures. The efficiency of invasive methods of prenatal diagnosis, and their role in decrease of perinatal disease and mortality was confirmed.