This study was undertaken to estimate ultrasound measurement of nuchal translucency (NT) thickness in normal fetuses between 11 and 13.6 weeks of gestation.The aim of this study was to establish normative data of nuchal translucency distribution in singleton pregnancies.600 fetuses with known normal outcome were included in this study. The distribution of median values of NT thickness with crown rump length(CRL) in 10 mm intervals and 95 th percentile were calculated with linear regression

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... d .False positive rates with increasing gestational age were studied. This study offers a normative data of fetal NT thickness in normal pregnancy, which can be used as a reference for screening chromosomal aberrations or other congenital abnormalities in the first trimester.