Increased nuchal translucency at a crown rump length < 45 mm

Aim: Nuchal translucency (NT) measurement is established for risk evaluation of chromosomal abnormalities between a crown rump length (CRL) of 45 to 84 mm. According to the german regulations the first ultrasound screening takes place between 9th and 11th week of gestation. This results in cases with increased NT and CRL < 45 mm, where risk calculation is impossible. In this retrospective study we analysed the outcome of these cases. Methods: Between July 2010 and September 2015 we identified 24 pregnancies with a CRL from 35 to 45 mm and a NT above the 95th centile adjusted for a CRL equivalent of 45 mm. Measur…