11 – 13 & 14 – 20 weeks
Better than the NHS combined & without the blood test
Every woman who is pregnant will be told about the nuchal scan as a way of detecting downs syndrome. In expert hands this nuchal screen alone can be very effective. With greater expertise, more anatomical checks can be made to give greater accuracy and rule out other anatomical conditions that may affect the pregnancy.
About Nuchal+ Scan
The nuchal scan is the most common screening test for Down’s Syndrome and other abnormalities and measures the fluid under the skin at the back of baby’s neck.
The risk result will be individually calculated, based on maternal age, how pregnant you are, the nuchal translucency measurement and up to 4 additional ultrasound chromosomal markers.
Because of restrictions in budget and adequate training, the NHS offers only a basic Nuchal measurement and does not assess other features such as the presence / absence of the nasal bone, ductus blood flow, tricuspid regurgitation and fetal heart rate which can significantly affect the risk. The detection rate in the NHS is between 70 – 90% and will depend upon where you have your scan.
Our Nuchal+ Scan will also check major anatomical structures and so rule out other abnormalities that are again not screened for in the NHS.
If your NHS scan fails to obtain the Nuchal measurement, then we advise you to call us immediately for an instant appointment. It is important to be seen, where possible before 14 weeks pregnant.
The Nuchal+ Scan is performed between 11 and 13 weeks.
We ask that you drink a pint of water one hour before the scan so that your bladder is full. This helps us to see the baby more clearly. In a very small number of cases due to baby’s position or the shape of the womb we will ask your consent to perform the scan internally (trans-vaginally).
We will show you everything we see as we go along, nothing is kept hidden from you and we will give you a picture for you to share with loved ones.
It is a great opportunity for you to talk and ask all the questions you need. Our clinical specialists have vast experience and will offer informed and supportive advice.
Ultrasound is safe, there are no known ill-effects, however, we do keep our scan times within recommended limits.
Nuchal+ Scan results
The chance of a problem is low when you receive less than 1 in 300 risk. While the baby could still have a problem, it is less likely that this is so.
A high risk result would be classed when you receive a risk result between 1 in 2 and 1 in 300. This does not mean that the baby is definitely affected. The vast majority of babies will still be normal but we advise further testing via amniocentesis, CVS or non-invasive prenatal testing.
About 1 in 37 pregnant women screened will be given an increased risk result. Most of these babies will not have a problem. 89% of babies with Down’s Syndrome and occasionally other problems will be detected.
We understand the devastation that a high-risk result can cause and will provide you with care and counselling to explain fully the significance of the risk result and the options still available to you should further testing be needed.
Nuchal+ Scan (NT)
The Nuchal+ Scan measures the nuchal translucency (NT) which is a fluid-filled space at the back of a baby’s neck. A measurement which is higher than expected may indicate that the baby has a particular chromosomal problem called Down’s Syndrome (Trisomy 21), or other chromosomal problems.
Nasal bone (NB)
A flat bridge or a poorly formed nasal bone can be indicative of Down’s Syndrome. If a baby has a well-defined nose bone, the risk is reduced. There is some variation in the appearance of the fetal nasal bone across different ethnic groups so experience is needed to correctly attribute the maternal ethnic group.
Ductus venosus (DV)
The Ductus venosus plays a critical role in providing oxygenated blood to your unborn baby’s brain and is screened for both chromosomal abnormalities and major cardiac defects.
Tricuspid regurgitation is a disorder in which the heart’s tricuspid valve does not close properly, causing blood to flow backward (leak) into the right upper heart chamber (atrium) when the right lower heart chamber (ventricle) contracts.
Intracranial translucency (IT)
The presence of intracranial translucency has been shown to reduce the risk of an open neural tube defect or spina bifida. If absent then there may be an increased risk and a detailed scan of the spine at 20 weeks is needed. It is a new marker and still being researched.
|Non-invasive Prenatal||Addmark®||Nuchal+||NHS Combined*|
|About the test|
|One stop service||YES||YES||YES||NO|
|Result availability||6+ days||immediate – 3 days||immediately||Up to 2+ weeks|
|Gestational age||10+ weeks||9 – 13 weeks||11 – 13 weeks||11 – 13 weeks|
|Fetal DNA analysis||YES||NO||NO||NO|
|Maternal blood mark||NO||4 – 8||NO||2|
|Nuchal translucency||11+ week scan||YES||YES||YES|
|Detailed anatomy check||11+ week scan||YES||YES||?|
|Nose Bone||11+ week scan||YES||YES||NO|
|Ductus Venous||11+ week scan||YES||YES||NO|
|Tricuspid Flow||11+ week scan||YES||YES||NO|
|Intra-cranial translucency||11+ week scan||YES||YES||NO|
|Down’s Syndrome T21||YES||YES||YES||YES|
|Patau Syndrome T13||YES||YES||YES||NO|
|Down’s Detection||>99%||93%||89%||up to 90%|
|Chance of high risk result||1 in 3,000||1 in 166||1 in 40%||1 in 30|
|0.01%||0.2%||2.8%||2 – 3%|
|Peace of mind||From £295||£195||£120||NHS|
Why choose this is my: for your 11 – 13 week pregnancy scan?
Nuchal screening is best performed between 11 weeks and 13 weeks + 6 days but for those women who have missed this time window we are able to offer a second trimester screening test, see Genmark™.
Screening at this is my: centres are carried out by highly specialised professionals dedicated to the screening process. Results are produced with increased accuracy that can be far better than any test available via the NHS or other private pregnancy clinics. It is important when choosing a test location to check what screening method is used, what markers are used and what detection and positive rates are quoted.
Why? At this is my we check more of your baby’s anatomy and measure many more markers to calculate risk and assess your baby’s well-being.