Pregnancy screen (nuchal translucency screen) at London Ultrasound Centre

Nuchal translucency screening, or NT screening, is an ultrasound test. It screens for Down syndrome (trisomy 21, meaning an extra copy of chromosome 21) and other disorders that are caused by extra copies of chromosomes (trisomy 13, trisomy 18), as well as congenital heart defects. Nuchal translucency screening is done during an ultrasound. The sonographer will first move the transducer across your belly to measure your baby from crown to rump to ensure that the fetal age is accurate. Then he or she will locate and measure the nuchal fold.