Your pregnancy – What to expect
A nuchal translucency screening, or NT screening, is a specialized routine ultrasound performed between week 11 and week 13 of pregnancy. Fetuses with increased fluid at the base of their necks — a spot known as the nuchal fold — may have a chromosomal problem such as Down syndrome. Nuchal translucency is a prenatal screening , which means the results can’t tell you for sure whether your child has a chromosomal disorder, only the statistical likelihood.
It’s often combined with a blood test to offer more insight into the relative odds of your baby being born with a genetic disorder.
A nuchal translucency screening, or NT screening, is a specialized routine ultrasound performed between week 11 and week 13 of pregnancy.
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.
Early pregnancy scan (booking or dating scan)
Section 3. If it is not possible to obtain the nuchal translucency NT measurement at the first appointment, at least one other attempt should be offered. This may be on the same day or at a later date.
12 Week Nuchal Translucency Scan and Blood Test. The week pregnancy ultrasound scan, or nuchal scan, is the first routine scan of pregnancy. You can have.
Normal babies accumulate fluid under the skin behind the head and neck between 9 and 14 weeks of pregnancy, however, excess fluid has been associated with chromosome abnormalities such as Down syndrome. The Nuchal Translucency NT tends to be larger in a baby that might be affected by a chromosome abnormality and it can be compared with what is expected for a baby of the same size NT Normal Range. The assessment of these elements age, blood, scan combined give us a comprehensive understanding of the likelihood of your baby being affected by a chromosome abnormality.
The levels can be assessed from a simple blood test taken from you either before or on the same day as the Nuchal Translucency ultrasound is performed. The results can be compared to the expected results in a pregnancy at the same gestational age. We recommend having your 12 — 14 week scan at the same time, there are many benefits to this scan including:.
If your results indicate that you have an increased risk of a baby with a chromosome abnormality, you will be offered further prenatal testing. Remember, any woman who falls pregnant can have a child with a chromosome problem, but the risk increases with age. For more information on Nuchal Translucency NT , as well as our comprehensive assessment NT — plus, please get in touch with us.
You will need a copy of your referral to complete a booking. Due to the time required for some appointments, not all appointments can be booked online, for more information, please read our booking guideline. Obstetric Ultrasound. Week Nuchal translucency is the name for the fluid behind the neck of your baby.
How do I prepare?
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.
At the time of the NT ultrasound, the sonographer or physician who does the scan can also accurately predict your due date, determine how many babies you.
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 The risk rises with maternal age from 1 in pregnancies below age 25, to 1 in at age 35, to 1 in at age In , Sequenom announced the launch of MaterniT21, a non-invasive blood test with a high level of accuracy in detecting Down syndrome and a handful of other chromosomal abnormalities.
As of , there are five commercial versions of this screen called cell-free fetal DNA screening available in the United States. Blood testing is also used to look for abnormal levels of alphafetoprotein or hormones. The results of all three factors may indicate a higher risk.
This first routine scan is carried out for the following reasons:. It is not diagnostic. We also like to arrange this for around 12 weeks, but it can be performed between 10 and 14 weeks.
This scan is carried out from 11 weeks to 13 weeks and six days. Confirm baby’s gestational age and corresponding due date; Scan for major abnormalities.
It’s offered to all pregnant women, along with a blood test, in first-trimester combined screening options. The NT scan measures the clear translucent space in the tissue at the back of your baby’s neck. This is the “nuchal translucency. Some practitioners also look for the presence of the fetal nasal bone during the NT scan. If no nasal bone is seen in the developing baby, some experts believe this increases the likelihood of chromosomal abnormalities. In some very specialized testing centers, other major abnormalities may be detected during the scan.
The NT scan is not invasive, and it’s not conclusive. Diagnostic testing such as CVS or amniocentesis are necessary to confirm a positive screen result. 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.
12 Week Scan
We will also look at the placenta, amniotic fluid and umbilical cord. Pregnant women are offered two routine ultrasound scans during pregnancy, this is called the Fetal Anomaly Screening Programme. The other routine pregnancy scan offered by the NHS is around 20 weeks of pregnancy called the Anomaly scan. Parents to be will be given an individual chance of baby having a chromosomal condition present.
The NT scan can be combined with a blood test, known as the first trimester combined screening, to get a more accurate prediction. The blood test will measure.
This page has information about ultrasounds and pregnant women in the Northern Territory NT. It is recommended that you have an ultrasound at 18 to 20 weeks. You can also have one early in your pregnancy if you are wanting to have genetic testing done or to confirm dates. Your doctor or midwife will tell you if you need another ultrasound later in your pregnancy. Your doctor or midwife can organise and discuss all ultrasounds that are recommended in pregnancy.
A nuchal translucency ultrasound between 11 and 13 weeks and up to six days can be used to check if your baby has abnormalities. If you wish to screen for Down syndrome and neural tube defects this scan can be used in conjunction with a blood test. You can also screen for neural tube defects as part of this ultrasound. This gives a clear view of your baby’s spine at this gestation.
Can’t get an accurate nuchal translucency measurement? Don’t let women miss out
Back to Your pregnancy and baby guide. All pregnant women in England are offered an ultrasound scan at around 8 to 14 weeks of pregnancy. This is called the dating scan. It’s used to see how far along in your pregnancy you are and check your baby’s development. Your midwife or doctor will book you a dating scan appointment.
She may use this information to give you a new estimated date of birth. The dating scan can include a nuchal translucency (NT) scan, which is.
This examination has become extremely important in the early diagnosis of congenital anomalies and chromosomal disorders. Combined with 1st trimester biochemistry, it is the most sensitive, non-invasive risk assessment for aneuploidy currently available in Australia. The test should be preceded by appropriate counselling in all cases. All women are at risk of having an aneuploid fetus. Many international professional organisations suggest the 12 Week NT Assessment be offered to all pregnant women regardless of age due to the benefits of early aneuploid detection and reduction in unnecessary prenatal invasive testing.
A local Accreditation Board has been established in Australia since for the training, monitoring, auditing and supervision of this examination. The 12 week scan is also useful for early diagnosis of missed abortion, multiple pregnancies, major structural congenital anomalies, uterine fibroids and ovarian pathology that may influence the course of pregnancy. It also enables visualization of early fetal anatomy.
Details of accreditation and performance of this scan are provided and updated on the Nuchal Translucency — Ultrasound and Monitoring Program web site. Information for combined risk assessment includes — maternal age, weight, smoking, ethnicity, past history of chromosomal abnormality and maternal diabetes. The date and details of the laboratory where biochemistry was performed needs to be included. Top of page Indications for Nuchal Translucency Scan There are many potential clinical indications for a 12 week Nuchal Translucency scan.
The main aims are to assess: Risk assessment for aneuploidy; Gestational age; Number of fetal poles; Presence of fetal cardiac activity; Gross fetal anatomy; and Pelvic masses and uterine malformations.
Nuchal Translucency Scan
Nuchal translucency is the name for the normal fluid space behind the neck of a foetus unborn baby that can be seen on ultrasound scans. A nuchal translucency scan also called first trimester of pregnancy screening is carried out during weeks 11—13 of a pregnancy. The scan uses ultrasound to screen for Down syndrome, or other chromosomal or inherited conditions in the foetus. Other non-chromosomal conditions, such as neural tube defects, abdominal wall defects, limb abnormalities and some congenital heart disease, can also be detected at this stage of the pregnancy.
Think about the prenatal screening tests you might have, and whether you want a dating scan to confirm your due date. Learn about pregnancy week 10 here.
OHSU brings you safe, excellent care — in person and in virtual visits. Call your clinic or see MyChart for details. This scan is carried out from 11 weeks to 13 weeks and six days. The scan is usually performed transabdominally but in a few cases it may be necessary to do the examination transvaginally. Nuchal translucensy NT is the clear space in the tissue of your developing baby’s neck. An NT measurement can help your healthcare practitioner assess your baby’s risk of having down syndrome and some other chromosomal abnormalities as well as major congenital heart problems.
Major abnormalities may be visible at this gestation. We will check whether your baby has all its limbs, that the head and brain appear to be developing normally, that the baby has a visible stomach and bladder and the umbilical cord is inserted correctly. From 12 weeks the spine can usually be seen clearly enough to rule out major cases of spina bifida. All of this information provides important reassurance.