Nuchal scan accurate dating
You won’t have known that you’re pregnant long, but your 12 week dating scan offers an exciting opportunity to see your little one developing in the womb and give you an idea of your estimated due date (EDD).You should have your first pregnancy ultrasound scan in between 10 weeks and 13 weeks pregnant, but it can vary on a couple of other factors including where you live and how you’ve been up to the 12th week of pregnancy.
It can be frustrating and worrying if you’re not given a definite answer, but it is important to have a fast and effective way of screening for potential problems with putting baby at any risk.This will be a lot more accurate than working it out just using the date of your last period.• Find out if the baby is growing in the right place • Find out if you’re expecting twins, triplets or more!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).If no nasal bone is seen in the developing baby, some experts believe this increases the likelihood of chromosomal abnormalities.)Like other screening tests, an NT scan won't give you a diagnosis.
The scan can only assess your baby's risk for certain problems and help you decide whether to have chorionic villus sampling (CVS) or amniocentesis to find out whether your baby is actually affected.
Babies with abnormalities tend to accumulate more fluid at the back of their neck during the first trimester, causing this clear space to be larger than average. The NT scan must be done when you're between 11 and 14 weeks pregnant, because this is when the base of your baby's neck is still transparent.
(The last day you can have it is the day you turn 13 weeks and 6 days pregnant.) It's usually offered along with a blood test in first-trimester combined screening options.(Some practitioners also look for the presence of the fetal nasal bone in the first trimester.
The nuchal translucency scan (also called the NT scan) uses ultrasound to assess your developing baby's risk of having Down syndrome (DS) and some other chromosomal abnormalities, as well as major congenital heart problems.
The NT scan measures the clear (translucent) space in the tissue at the back of your baby's neck.
Nuchal translucency (NT) can be measured using ultrasound when your baby is between 11 weeks and 13 weeks plus six days old.