Do I need to do Down syndrome screening if nt is normal?

Generally speaking, after a woman becomes pregnant, she will usually undergo regular prenatal checkups in order to understand the healthy growth and development of the baby in her belly. Of course, these industry items are also very important for the health of pregnant mothers and babies, and one of them is called the NT test. In fact, both the NT test and the Down syndrome screening test are to test the probability of the fetus in the belly suffering from Down syndrome. So if the result of the NT test is normal, do you need to do the Down syndrome screening test again in the future? Let’s find out together.

First, let us understand what NT test is. The first NT test is a straight mirror system, or the transparent layer, which is one of the bases for testing the probability of Down syndrome in the early stages of pregnancy. This is also a routine test to detect whether there is a sex chromosome disease or other abnormalities, so as to help rule out deformities.

The normal result of this test should be less than three mm. If it exceeds this, it proves that there is a problem with the growth and development of the fetus in the womb. Therefore, it is necessary to pay special attention to the subsequent Down syndrome screening test and four-dimensional color ultrasound for investigation. Of course, some people are more curious. If the NT test is done in the early pregnancy and the result is normal, is it necessary to do the Down screening test again in the second trimester?

If I do a prenatal check-up and the NT test results are normal, do I still need to do a Down syndrome screening? Pregnant mothers are in control

Although both the NT test and Down syndrome screening test are for fetal abnormality screening, there are still some differences in the testing process and purpose. The so-called NT test is to check whether the fetus in the belly has chromosomal diseases in the early pregnancy, and if other abnormalities are found, they need to be checked in the Down syndrome screening test in the second trimester of pregnancy.

And the time and purpose of the examination are also different. Because the NT test is done between the 11th and 14th weeks of pregnancy, and the Down screening test is done in the second trimester of pregnancy, there will be a certain difference in time. Therefore, in order to ensure the healthy growth and development of the baby in the belly, it is better to do both tests.