This test combines ultrasound measurement of nuchal translucency (fluid under the skin at the back of the baby’s neck) with two proteins (free beta HCG and PAPPA) from the maternal blood. Together with the maternal age to calculate an overall risk for fetal Down syndrome as well as Trisomy 18. Increased NT can also help to identify fetuses that may have certain types of birth defects, such as heart defects. This test is offered to our pregnant patients between 11-14 weeks pregnant. The detection rate is 85%-90%, false positive rate 5-7% for Fetal Down Syndrome.
Ultrasound in Pregnancy
Generally, at 18 and 30 weeks gestation, ultrasounds are performed. We have found that an 18-week ultra-sound is very reassuring to us and you. This ultrasound demonstrates anatomy, placental placement, fluid and fetal movement. Many problems can be identified during this ultrasound. At the 18-week scan, gender can be determined, if this is your desire. A 30-week ultrasound demonstrates fetal growth, placental aging and fluid accumulation. If you have questions or reservations about ultrasounds, please feel free to discuss them with us. Remember bring a CD-R for still photos of your ultrasound for a keepsake that you can share with your family and friends.