The nuchal Translucency screening test is one of the essential prenatal screening. It helps detect the Down syndrome in the fetus. And the point is you have to take it on time.
What is the nuchal translucency screening test?
Nuchal translucency is a way to check the nape of the fetal neck to diagnose Down syndrome. This test is entirely harmless for both the mother and the fetus. If the ultrasound measurement of the fetus’s nuchal translucency is abnormal, mom will need to perform a few other tests to determine whether your baby has Down syndrome.
Through the ultrasound scan of the nape of the neck, women can continue to be ordered to do some other tests such as amniocentesis, the umbilical cord. At the same time, the Doctor will instruct you to have a blood test to measure HCG and PAPP-A protein. At that time, the diagnosis of Down Syndrome in the children can give accurate results up to 90%. It is a combination technique.
What is the best time to take the test?
The best time to take the Nuchal translucency screening test is at the age of 11 weeks, one day to 13 weeks, six days of pregnancy. However, in the first few weeks, the fetus may have different growth rates and a slight difference from the theoretical calculations.
Before the 11th week, it is tough to measure because the fetus is too young. After the 14th week, the excess fluid accumulated in the nape of the neck will be absorbed by the developing lymphatic system of the fetus. And as a result, the nape of the neck will return to normal so that ultrasound measurement no longer makes sense.
Therefore, it is essential to perform a nuchal translucency screening test between 11 and 14 weeks of pregnancy.
How to read the result of the test?
The Doctor usually does the test via ultrasound. But in some cases, the Doctor will perform a vaginal scan for the mother for more accurate results. There is no danger to the mother or baby during operation.
If the index is high, the Doctor will order a woman with amniocentesis for weeks 17-18 of pregnancy to diagnose the disease. This ultrasound can also detect some other abnormalities such as cranial fetus, abdominal cavity, no nasal bone.
Many mothers go for an ultrasound, too, so the fetal outcomes are still developing well. However, babies are born with unusual problems. The leading cause of this condition in children is because the pregnant women skip the ultrasound phase to measure the opacity of the nape of the neck at the necessary time.
The mother only insists on periodic ultrasound results and forgot that to ensure the development of the fetus; you have to perform mother tests together.
Ultrasound results of Nuchal translucency when the 11-week-old fetus is usually 2mm, 13 weeks and six days is 28mm. And these indexes indicate a healthy embryo. If ultrasound measures the nuchal translucency greater than 3mm, the baby is at risk of Down syndrome. The thicker the Nuchal transparency is, the more dangerous it is.