When is the best time to have my Nuchal scan?
The nuchal translucency scan is combined with a blood test and an early examination of baby. The research data on which this type of screening is based tells us that the scan should be done between 11 weeks and 13 weeks and 6 days. More precisely this equates to a quite narrow range for the fetal head to bottom measurement (crown rump length). Scan information outside this range is not interpretable in the same way.
