Obstetric nuchal dating scan

15 Aug

The process will involve lying back on a bed, with gel applied to your belly.The sonographer will then use a transducer device which uses ultrasound to produce an image of your baby inside the womb to a small display screen next to you. The dating scan is the first time you (or anyone) will have seen your baby so there’s a few things that your sonographer will look out for and things you’ll find out: • How many weeks pregnant you are, and your EDD (estimated date of delivery).Nuchal translucency ultrasound alone can also provide this risk assessment, but it is not as accurate as combined first trimester screening.Combined first trimester screening is a non-invasive way of assessing your risk, which means it does not involve putting needles into the placenta or amniotic sac, as happens with CVS and amniocentesis.Chorionic villus sampling and amniocentesis are invasive tests, involving putting needles into the placenta or amniotic sac, and they are associated with an increased risk of miscarriage.For more information of prenatal diagnostic testing, please go to: The nuchal translucency is the fluid found at the back of your baby’s head and neck, just beneath the skin.In around 3 to 5% of pregnancies, results are classified as higher risk, but most of those women will still go on to have healthy babies.

For example, it tells us whether your baby has a low risk of having trisomy 13, 18 or 21, or whether your baby has a high risk of having trisomy 13, 18 or 21.

We know that the amount of fluid can increase in the presence of certain conditions, producing a thicker NT measurement.

Conditions associated with an increased NT measurement include some chromosome abnormalities (for example, trisomy 13, 18 and 21) and some structural problems (for example, heart abnormalities).

This can be a bit uncomfortable if you have to wait with a full bladder but it does put your uterus in a better position for scanning.

The dating scan is non-intrusive and won’t be painful; in fact, it can be quite a relaxing and exciting experience to see your little one and their tiny heartbeat for the first time.