[Chorionic villus needle sampling by the transabdominal route or by placental centesis. A series of 930 cases].

The authors report on a series of 930 chorion villus sampling diagnoses made with a needle by the transabdominal route, from January 1991 to October 1992 at the Prenatal Diagnosis Center in Marseille. Indications for prenatal diagnosis were: raised maternal age in 75% of cases (N:698); ultrasound findings in 11% (N:106), chromosome abnormalities in the family in 6% cases (N:53), raised human chorionic gonadotrophin in 4% cases (N:38), parental rearrangement in 2% cases (N:20), and sex linked disease in 1% (N:15). The success rate was 97% with 29 failures; the number of needle insertions was one in 97% cases and two in 3% cases. The average gestational age at sampling was related to the indications; 16 weeks of amenorrhoea for raised maternal age, and 22 weeks of amenorrhoea for ultrasound findings. Thirty one abnormalities were observed, four balanced translocations, and seven placental mosaicisms. Forty eight pregnancies terminated in abortion. The rate of fetal loss was 3.5% (7 cases) for the 200 first cases and 1% (8 cases) for the 730 following cases. Choriocentesis through the transabdominal route provides a diagnosis within a few days and the rate of fetal loss is close to that of amniocentesis. These arguments are in favour of an extension of this method of sampling.