An NT is a special type of ultrasound using a very sensitive but safe machine. A sonographer will apply a transducer (wand) to the outside of your stomach to measure your baby from crown to rump and check that the fetal age is accurate. Then he or she will locate the nuchal fold and measure its thickness on the screen.

How is NT scan done in pregnancy?

The nuchal translucency scan is done between 11 and 14 weeks of pregnancy. It might need to be done alone, or it might be able to be done while youre having your dating scan. Usually the scan is done through your abdomen but occasionally the nuchal translucency can only be seen by inserting a probe into the vagina.

How do I prepare for a NT scan?

To ensure clear images, you will be asked to attend with a full bladder. This is achieved by emptying your bladder 2 hours before your appointment and then immediately drinking 600ml of water. Do not empty your bladder again before the procedure. You may eat normally and take any necessary medication.

When is too late for NT scan?

Its too late to do the NT scan after 14 weeks, as any excess nuchal fluid may be absorbed by your babys developing body . Youll be offered a screening test in your second trimester if for any reason your scan doesnt happen before 14 weeks .