[Fetal chromosome studies in the first trimester of pregnancy]. / Issledovaniia khromosom ploda v pervom trimestre beremennosti.

The possibility of transcervical biopsy of chorion by the method of forceps and production of "direct" preparations of chromosomes in the first trimester of pregnancy has been studied. Satisfactory preparations are obtained during short-term incubation of villi for 24 and 48 hours. Portion of complete metaphases constitutes 0.23.