Why It Is Done A nuchal translucency test is done to find out the chance that your developing baby fetus may be at risk for having Down syndrome or other problems. How To Prepare You may need a full bladder for the nuchal translucency test. How It Is Done Most often, a nuchal translucency test is done by a specially trained ultrasound technologist. For an abdominal ultrasound: You'll lie down on your back or on your side on an examination table.
A gel will be spread on your belly. A small, hand-held device called a transducer will be pressed against the gel on your skin and moved over your belly. Images of the baby are displayed on a monitor. The technologist or doctor will look for and measure the thickness of the fluid buildup at the back of the baby's neck. How long the test takes The test usually takes about 15 to 20 minutes. How It Feels During a nuchal translucency test, you may have a feeling of pressure in your bladder.
Risks There are no known risks linked with a nuchal translucency test, either to you or the baby. Results Your doctor will look at the results of the nuchal translucency test to see if the area at the back of the baby's neck is thicker than normal. How accurate is the test? For example: The nuchal translucency test correctly finds Down syndrome in 64 to 70 out of fetuses who have it. It misses Down syndrome in 30 to 36 out of fetuses.
Screening for fetal aneuploidy. Obstetrics and Gynecology , 5 : e—e DOI: Accessed April 6, Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Updated visitor guidelines. Top of the page. Nuchal Translucency Screening Test. Why It Is Done A nuchal translucency test is done to find out the chance that your developing baby fetus may be at risk for having Down syndrome or other problems.
How To Prepare You may need a full bladder for the nuchal translucency test. How It Is Done Most often, a nuchal translucency test is done by a specially trained ultrasound technologist. During the test: You'll lie down on your back or on your side on an exam table. A gel will be spread on your belly. A small, handheld device called a transducer will be pressed against the gel on your skin and moved over your belly. Images of the baby are displayed on a monitor.
The technologist or doctor will look for and measure the thickness of the fluid buildup at the back of the baby's neck. The test usually takes about 15 to 20 minutes. How It Feels During a nuchal translucency test, you may have a feeling of pressure in your bladder. Risks There are no known risks linked with a nuchal translucency test, either to you or the baby.
Results Your doctor will look at the results of the nuchal translucency test to see if the area at the back of the baby's neck is thicker than normal. Nuchal translucency test footnote 1 Normal: 2. How accurate is the test? The accuracy of this test is based on how often the test correctly finds a problem. You can also call Pregnancy, Birth and Baby on to talk about these tests and what the results could mean for you and your pregnancy.
Learn more here about the development and quality assurance of healthdirect content. InsideRadiology provides free and easily accessible, accurate, up to date and credible information about medical imaging tests and procedures. Read more on InsideRadiology website. Most women will have at least one ultrasound scan during their pregnancy. It usually takes place between 18 weeks and 21 weeks. A vaginal ultrasound also called an internal, pelvic or transvaginal ultrasound lets a medical professional observe a fetus and check reproductive health.
Handy infographic that shows what you can expect at each antenatal appointment during your pregnancy. Down syndrome is a chromosomal disorder affecting 1 in 1, babies. Screening tests for Down syndrome are routinely offered to pregnant women.
Questions to ask your doctor about the tests and scans you will be offered during your pregnancy. Read more on Better Health Channel website.
A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Learn more about how the procedure is performed. In the second trimester of pregnancy, you may be offered to have an morphology scan anomaly scan.
Learn about what it looks for and when it is performed. Pregnancy, Birth and Baby is not responsible for the content and advertising on the external website you are now entering.
And 5 to 21 percent of babies who have DS will be determined to be at normal risk — that is, the results will be misleading. Screening tests aren't perfect. They don't detect all cases of DS, so they may identify your baby as being at low risk when they really do have DS. In other words, if you're carrying a baby with DS, there's a 79 to 90 percent chance that the combined screening will detect the abnormality and give you what's called a screen-positive result indicating that further testing is recommended.
But it also means there's a 5 to 21 percent chance that the tests will miss the DS and give you a screen-negative result. This is called a false negative result, and it might lead you to decide against diagnostic testing that would have revealed a problem. These tests also have a 5 percent false-positive rate.
A false-positive result is one that suggests that your baby is at increased risk for DS or another condition when, in fact, there's no problem. With the help of your practitioner or a genetic counselor , you'll want to decide whether the results indicate a high enough risk that you want to have CVS or amniocentesis to get a definitive diagnosis. In making your decision, you'll need to weigh your need to know about your baby's condition against the small chance that diagnostic testing could cause a miscarriage.
If you decide not to have diagnostic testing, you can get more information about your baby's health and development by following up with NIPT a blood test that's available to all pregnant women beginning at 10 weeks of pregnancy , the quad screen a blood test in the second trimester , and a detailed ultrasound at 18 to 20 weeks. This ultrasound can detect "soft markers" of chromosome disorders, such as short limbs, a bright dot in the heart, a bright bowel, and certain problems in the kidneys.
It can also look for anatomical defects, such as spina bifida. BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals.
We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies. Prenatal genetic screening tests. American College of Obstetricians and Gynecologists. March of Dimes. Down syndrome. Nuchal translucency test. What tests might I need during pregnancy?
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