![]() The sonographer positions the sensor, called the transducer, over your abdomen so that your baby's nuchal fold area shows up on the monitor, and measures the thickness of it on the screen with calipers. The sonographer first confirms your baby's gestational age by measuring your baby from crown to rump to see if he's about the size he should be for his age. (The last day you can have it done is the day you turn 13 weeks and 6 days pregnant.) The Nuchal SonoLucency screening must be done when you're between 11 and 14 weeks pregnant. ![]() Only the amniocentesis or CVS placental sampling can be considered "diagnostic". While the Nuchal SonoLucency screening test won't give you the definite diagnosis you'd get from more invasive tests like CVS and amniocentesis, it can help you decide whether you want to undergo MaterniT21® blood testing or amniocentesis. ![]() When combined with the Quad screen at 16 weeks you have the SEQUENTIAL SCREEN, which is the best of the noninvasive screens for down syndrome, trisomy 13, trisomy 18, and spina bifida.īabies with abnormalities tend to accumulate more fluid at the back of their neck during the first trimester, causing this clear space to be larger. That measurement can help assess your baby's risk for Down syndrome (DS) and other chromosomal abnormalities as well as major congenital heart problems. This prenatal screening test (also called the nuchal fold scan) uses ultrasound to measure the clear ("translucent") space in the tissue at the back of your developing baby's neck, and is combined with measurement of two hormones in mom's blood.
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