NT examination, now a routine examination item, is the main method for screening children with Down's syndrome. Many pregnant mothers also have a preliminary understanding of nt exam when visiting the forum. But because we all learn fragmentation in fragmentation time, we may not be particularly clear about the whole context of NT inspection. So, today I will systematically sort out those things about NT inspection.

First of all, let's talk about what NT test is. NT refers to the transparent layer of the baby's neck. Before the baby's lymphatic system is sound, a small amount of lymph will gather in the neck to form a transparent layer, which is nt. NT examination is to measure the thickness of the zona pellucida of the fetal neck by B-ultrasound, so as to infer whether there is congenital abnormality in the fetus. Clinical data show that a few fetuses with NT thickening will have chromosomal abnormalities, and the most common one is Down syndrome. In addition, the risk of congenital heart disease, malformation and other diseases will increase with NT thickening.

Generally speaking, the thicker the NT, the worse. It is normal that the thickness of NT is less than 2.5 mm in clinic. But NT thickening does not mean that the baby must be Down's son! NT thickening is only a screening method, which means that the risk of abnormality in infants is higher than that in the general population. Most of the babies with NT thickening were just a false alarm, and no abnormality was found after further examination. As? Women are weak and mothers are strong? Pregnant mothers' attitude towards nt examination should be:? No anxiety, no neglect? . If the doctor tells you that your baby's NT is thickened, you must listen carefully to the doctor's explanation and cooperate with the doctor for further examination.

Knowing what NT test is, you should know when to do it. NT examination is generally completed by B-ultrasound in pregnancy 1 1 week to pregnancy 13 weeks +6 days. At this time, the fetal head and buttocks are about 45 ~ 84 mm long, and the data can be measured by B-ultrasound. At this point in time, general obstetricians will remind pregnant mothers to remember themselves, because:

The thickness of NT can be measured at 10 ~ 13 weeks of pregnancy, and decreased to 1 1% at 14 weeks of pregnancy. Why? The reason is that 1 1 the baby is too small before pregnancy, and the scanning technology is difficult; After 0/4 weeks of pregnancy, too much fluid may be absorbed by the baby's developing lymphatic system, and the measurement results will become more and more inaccurate.

In addition, we also recommend that pregnant mothers have nt examination before 13 weeks of pregnancy. Because when measuring NT, doctors need to change the position of pregnant mother or probe to find the most suitable position to get the most accurate test results. Sometimes the baby in the belly doesn't cooperate and can't get the correct posture, so the pregnant mother needs to take a walk first and then test it after the baby's posture changes. Unfortunately, if you can't find the correct posture after several attempts, then the pregnant mother can only make an appointment for the next examination. Therefore, in order to avoid this situation, pregnant mothers had better do it in advance. In case they can't measure it, they can make it up again.

Having said that, do you have a clearer understanding of NT inspection? Next, let's draw the key points. Pregnant mothers who can't remember everything, just remember these points!

1.NT examination is mainly to check whether the fetus has congenital abnormalities, and it is mainly used to screen children with Down's syndrome.

2. The time of 2.NT examination is between pregnancy 1 1 week pregnancy 13 weeks +6 days. It is best to have a checkup before 13 weeks of pregnancy.

3. The thicker 3.NT is, the worse it is, and the greater the risk of fetal abnormality. NT greater than or equal to 2.5 mm is regarded as NT thickening.