This combined test is an extremely accurate non-invasive screening test available to help identify a fetus at risk for Down syndrome as well as other chromosomal abnormalities and some major structural abnormalities. The sensitivity of this only recently eclipsed by NIPT. An ultrasound screening test is non-invasive and does not have any side effects or complications. The only way to diagnose Down syndrome or other chromosomal abnormalities is by having a diagnostic test — either a CVS or an amniocentesis — and testing the fetal cells. These tests are invasive and require a needle to be passed into the maternal abdomen and uterus and therefore carry a small risk of miscarriage. Many patients do not wish to have the diagnostic test because of the small risk of miscarriage and prefer to have the ultrasound screening test, the NT scan, to help them decide if they wish to proceed to testing the fetus. Unfortunately, while NT combined with the first trimester biochemical blood test is a very accurate screening test available for chromosomal abnormalities, it will not detect all fetuses affected with Down syndrome or other chromosomal abnormalities. Chromosomal abnormalities occur when there is a change in the number or structure of the chromosomes. Normally we have 46 chromosomes, 23 pairs numbered and a pair of sex chromosomes.
Screening for nuchal translucency
Now comes the moment when you might get to see your baby for the first time — the week scan. We run through what scans are and what to expect on the day. This is often just called a scan.
Most pregnant women will have an ultrasound scan during their pregnancy. This simple test is quite safe for both mother and baby and causes only minor, if any, discomfort. Ultrasound is a way of taking a look at the baby without using potentially dangerous X-rays. During an ultrasound scan, high-frequency soundwaves are used to create moving images of the developing baby, shown on a screen. Ultrasound scans may be recommended at various stages of pregnancy for several reasons.
Here are some examples. For women in Australia with an uncomplicated pregnancy , the following ultrasound scans may be recommended. A dating scan may be recommended if there is any uncertainty about when conception may have occurred for example, women who have irregular periods and those who are uncertain of the date of their last menstrual period.
Nuchal Translucency (NT) Ultrasound
There are a number of tests and scans available to you during your pregnancy. The nuchal translucency scan is an ultrasound that may detect the risk of a number of chromosomal abnormalities. A nuchal translucency scan is part of the ultrasound scan that most pregnant women have at around 12 weeks of pregnancy. The results of a nuchal translucency scan may tell you if your baby has a high or low risk of a chromosomal abnormality.
Examples of chromosomal abnormalities include trisomy 21 Down syndrome , trisomy 18 Edwards syndrome or trisomy 13 Patau syndrome.
For many women, an ultrasound or ‘dating scan’ around twelve weeks They may also measure nuchal translucency (a collection of fluid under the skin at the.
On the monitor, you will be able to see what the sonographer sees, though it may be difficult for you to interpret all of the images.
12 week scan: Your dating scan guide
Since chromosomal abnormalities can result in impaired cardiovascular development, a nuchal translucency scan is used as a screening, rather than diagnostic, tool for conditions such as Down syndrome , Patau syndrome , Edwards Syndrome , and non-genetic body-stalk anomaly. There are two distinct measurements: the size of the nuchal translucency and the thickness of the nuchal fold.
Nuchal translucency size is typically assessed at the end of the first trimester, between 11 weeks 3 days and 13 weeks 6 days of pregnancy. All women, whatever their age, have a small risk of delivering a baby with a physical or cognitive disability. The nuchal scan helps physicians estimate the risk of the fetus having Down syndrome or other abnormalities more accurately than by maternal age alone. Overall, the most common chromosomal disorder is Down syndrome trisomy
Nuchal Translucency Scan – This is also offered to pregnant mums at the same time as the Dating Scan. This assesses the risk of Down Syndrome in babies.
Visit NHS Choices for a detailed pregnancy and baby guide with lots of useful tips for parents to be. Act now to protect your baby from whooping cough from birth. You can request the vaccination from your midwife after your 20 week scan at your antenatal appointment or you can just turn up to Floor 1, Maternity between Monday — Friday 9am -5pm. It’s used to see how far along in your pregnancy you are and check your baby’s development.
This assesses the risk of Down Syndrome in babies. It is an optional test. You can book this at the same time as your 20 week scan. You will want to book onto an Antenatal Pregnancy Class.
Tests and scans
Log in Sign up. Community groups. Home Pregnancy Health Antenatal scans. In this article What is nuchal translucency? Why might I have a nuchal scan? How is the nuchal scan performed?
Nuchal translucency (NT) scan · helps to assess the chance of your baby having Down’s syndrome · is offered between 11 and 14 weeks of.
An ultrasound scan that helps the NHS confirm how many weeks pregnant you are, checks how your baby is developing – and gives you an amazing black and white photo to take home By Rachel Mostyn. They will also check that anatomically everything is where should be. Then you get your amazing pictures and you can tell the world! Not necessarily. Dating scans are offered at some point between 8 and 14 weeks, with most of them happening between 11 and 14 weeks.
As the transducer gets to work, a black-and-white image of your baby will appear on the monitor that the sonographer is looking at. Private providers may offer this earlier, however. In order to get the full results, the findings of the nuchal translucency NT part of your scan need to be combined with the findings of your blood test.
The browser you are using is too old for our website. Please visit www. Scans during pregnancy can make some mums-to-be a little nervy, which is perfectly natural. Most of the time scans are there to simply help confirm your little one is developing healthily – with the added bonus that you get to see your baby moving around.
A nuchal translucency (NT) scan screens your baby for these They can then enter your age or date of birth in a computer program to calculate.
Learn more. Ultrasounds use sound waves to create an image picture of your baby. They are used to look at your developing baby. An ultrasound is considered safe for both mother and baby because it does not use ionising radiation it is different to an x-ray. Your doctor or midwife will advise you when an ultrasound may be recommended. The following ultrasounds are common in pregnancy:. You can have your ultrasounds done at an imaging facility in the community.
Nuchal translucency scan
This scan allows us to check how your baby is developing and in combination with a blood test allows us to check for any genetic concerns. This scan should be ideally performed between 12 weeks 5 days and 13 weeks 6 days of your pregnancy. As well as checking that your baby is growing well and confirming your due date the main aim of the scan includes:.
On the day of your scan you can choose to have the results given to you by our resident radiologist or obstetrician or have the results delivered by your doctor or obstetrician at your follow-up appointment, please note: some specialist like their patients to return to them for the results.
Nuchal translucency NT is the sonographic appearance of a collection of fluid under the skin behind the fetal neck in the first-trimester of pregnancy. The term translucency is used, irrespective of whether it is septated or not and whether it is confined to the neck or envelopes the whole fetus. In fetuses with chromosomal abnormalities, cardiac defects and many genetic syndromes the NT thickness is increased.
The Fetal Medicine Foundation FMF has introduced a process of comprehensive training, support and audit for the proper implementation of early screening for chromosomal abnormalities. The FMF advocates that effective screening requires:. The requirements for obtaining the FMF certificate of competence in the nuchal translucency NT scan are:. If you want to visit your own FMF page please click here. Early screening for chromosomal abnormalities The Fetal Medicine Foundation FMF has introduced a process of comprehensive training, support and audit for the proper implementation of early screening for chromosomal abnormalities.
The FMF advocates that effective screening requires: Carrying out the ultrasound examination by appropriately trained sonographers. A risk calculation program that uses an algorithm based on scientific evidence. Appropriate counselling of the parents. Should they wish to use the additional markers for chromosomal abnormalities nasal bone, tricuspid flow and ductus venosus flow they would need to obtain the appropriate FMF Certificate for each of these markers.
Normal nuchal translucency High nuchal translucency.