Incidence of abortion after genetic amniocentesis in twin pregnancies

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Abstract
Fetal outcome after genetic amniocentesis (AC) in viable twin pregnancies was analysed in a retrospective study at three centres in order to estimate the rate of fetal loss after AC. The maternal age ranged from 33 to 45 years (mean 36.7 years). The gestational age varied between 15 and 20 weeks of gestation (mean 17.1). In 98 viable twin pregnancies with complete follow‐up, spontaneous abortion of both fetuses occurred within 28 completed weeks of gestation in eight pregnancies and six women aborted within 20 completed weeks of gestation after AC, corresponding to a rate of fetal loss of 8.1 and 6.1 per cent, respectively (excluding the loss of five twins with viable outcome of the co‐twin in five pregnancies).

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