When nuchal translucency was measured between 10 and 14 weeks' gestation, detection of trisomy 21 improved to 100% without loss of specificity. However, detection was only 56% at 15 and 16 weeks.

A new study provides large-scale, population-level evidence that nuchal translucency (NT) screens detect a wide range of genetic disorders at thresholds lower than the level currently considered ...