![]() How an NT screening is doneĪn NT is a special type of ultrasound done using a very sensitive but safe machine. After that, the tissue gets thicker and is no longer translucent, so test results become inconclusive. NT screening is usually done between weeks 11 1/2 and 13 1/2, but it must be performed between week 10 and week 13 of pregnancy. When a nuchal translucency screening is done ![]() If follow-up testing diagnoses a chromosomal disorder, it can allow you to prepare for your child's special needs.Īlthough NT is widely available, some rural and urban areas may not have the resources to perform the procedure. The results can help you make prenatal care decisions. It's ultimately up to you whether you have prenatal testing. Who should get a nuchal translucency screening?Ī nuchal translucency screen is recommended for all pregnant women and is often one of several routine prenatal screenings during the first trimester. In general, most doctors consider a normal NT measurement at 12 weeks to be under 3 millimeters. Normal NT measurements vary depending on how far along you are in your pregnancy. Group B Strep Testing During Pregnancy What is a normal NT measurement? Trusted Source Mayo Clinic First Trimester Screening See All Sources īecause false positives with the NT screening alone are relatively common, 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. It's a prenatal screening, which means it can't diagnose any condition. Keep in mind that nuchal translucency is not 100 percent accurate. The odds of a baby having a disorder increase with a mother's age, but they can happen to anyone at any age. They can cause intellectual disabilities and mild to severe birth defects. Trusted Source Johns Hopkins Medicine Combined First-Trimester Nuchal Translucency Screening See All Sources Īll of these conditions involve having an extra copy of a specific chromosome (chromosome 21, 18, or 13, respectively). Experts have found that this spot tends to accumulate fluid in babies with chromosomal abnormalities.īabies with increased fluid at the base of their necks are at a statistically increased risk of having a chromosomal problem, such as Down syndrome (trisomy 21), Edwards syndrome (trisomy 18) or Patau syndrome (trisomy 13). NT focuses on a small, clear space at the back of a growing baby's neck called the nuchal fold. ![]() It helps doctors determine if a baby is statistically more likely to have a chromosomal abnormality. A nuchal translucency screening, or NT screening, is a specialized routine ultrasound performed at the end of the first trimester of pregnancy.
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