[Risk assessment for fetal aneuploidy after nuchal translucency measurement.].

In this article the focus is on the estimation of a likelihood ratio by using software which calculates the risk for trisomy 13, 18 and 21. It is based on the woman s age, crown rump length of the fetus and its nuchal translucency measurement. Examples are given based on different maternal age, previous history and results of ultrasound examination.