The correlation in fetal NT in each euploid twin pregnancy was estimated.ResultsThe distribution of NT in both euploid and trisomic fetuses was consistent with the mixture model in singleton pregnancies. The correlation in fetal NT in each euploid twin pregnancy was estimated.The distribution of fetal NT for crown–rump length (CRL) was examined in 5646 dichorionic twin pregnancies, including 103 with fetal trisomies 21, 18 or 13. ObjectiveTo examine the distribution of fetal nuchal translucency (NT) thickness in dichorionic twins and investigate the effect of the correlation between NT measurements in each twin pair on the performance of screening for trisomies.To examine the distribution of fetal nuchal translucency (NT) thickness in dichorionic twins and investigate the effect of the correlation between NT measurements in each twin pair on the performance of screening for trisomies.MethodsThe distribution of fetal NT for crown–rump length (CRL) was examined in 5646 dichorionic twin pregnancies, including 103 with fetal trisomies 21, 18 or 13.
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