Nt is fine, generally non-invasive, no problem.

Nt is fine, generally non-invasive, no problem.

Nt is fine, generally no problem. Nt examination is one of the pregnancy examination items, but many mothers don't know much about NT examination. This is a method to evaluate whether the fetus has Down syndrome. The following NT is ok, generally no problem.

Nt is ok, and it is ok if it is generally non-invasive. 1 NT can, but it doesn't mean that it can be non-invasive. NT examination is carried out in the first trimester of pregnancy, and the thickness of the hyaline membrane in the fetal neck can be observed by ultrasound, which can preliminarily judge whether the fetus may have chromosomal diseases and congenital heart disease. However, because NT examination is only an imaging examination, there are still some mistakes. So even if NT is fine, the fetus may have chromosome diseases, which will be shown in the non-invasive DNA examination. Therefore, it is not possible to exclude all chromosomal diseases simply by NT examination, but to do prenatal examination regularly, conduct non-invasive DNA screening, and conduct amniocentesis when necessary to exclude whether the fetus has chromosomal diseases.

What is the NT inspection for?

1, the fetus with Down syndrome will have subcutaneous effusion, so the skin behind the neck will be thicker. If the thickness of fetal neck skin detected by NT exceeds the standard value, it may be related to abnormal fetal karyotype and other structural abnormalities. The thicker NT, the greater the probability of abnormal fetal structure and chromosome.

2. In addition to detecting the risk of chromosomal abnormalities, the thickening of fetal neck zona pellucida is also related to congenital heart disease.

If the NT test results are beyond the standard range, it is suggested that pregnant women should have a follow-up abnormal examination to further confirm the risk of fetal abnormality so as to take countermeasures as soon as possible.

This kind of screening is mainly done by ultrasonic scanning, usually on the pregnant mother's stomach, but it also depends on the position of the baby and uterus. Vaginal ultrasound should be done if necessary, so that you can see more clearly.

In order to accurately determine whether you are pregnant, the B-ultrasound doctor will measure the length of the baby's head and buttocks and the width of the transparent belt at the back of the neck. Under B-ultrasound, the baby's skin looks like a white line, while the liquid under the skin looks black. At this stage, the baby looks very clear and can see his head, spine, limbs, hands and feet. Although this B-ultrasound may rule out some major malformations, it is recommended that pregnant mothers have a detailed B-ultrasound at 20 weeks.

Nt is fine, generally non-invasive, no problem. 2 When does pregnant mother start nt examination?

NT examination is best done in 1 1~ 14 weeks of pregnancy, and it will be inaccurate if it exceeds 14 weeks, and the time of Bitang's syndrome is earlier. NT examination is mainly determined by B-ultrasound, and the final measured value is less than 3 mm. If it exceeds 3 mm, further examination, such as amniocentesis, should be considered. ..

The purpose of NT examination is to diagnose chromosomal diseases and find fetal abnormalities caused by various reasons in the early pregnancy.

According to relevant statistics, after nt examination and blood test, the detection rate of Down syndrome can reach more than 85%. In addition to pregnant women who have been diagnosed with amniocentesis, it is best for pregnant mothers to do maternal blood screening for Down syndrome and zona pellucida examination of fetal neck to ensure the birth of healthy babies.

If the pregnant mother is found to be a high-risk group through cervical zona pellucida examination, it does not mean that there must be something wrong with the fetus. Further diagnostic tests (including chorionic villi collection at 1 1~ 15 weeks or amniocentesis at 16 ~ 20 weeks) are needed to determine whether the fetus has Down syndrome or other congenital diseases.

What are the precautions for NT inspection?

1, NT (transparent area scan behind neck) examination is a kind of B-ultrasound examination, and blood test is not needed. Eating and drinking will not affect the test results, so you don't need an empty stomach before the test.

2. Because the fetus is too small before 1 1 week of pregnancy, the posterior cervical zona pellucida cannot be observed, and because the fetus develops gradually after 14 weeks of pregnancy, the cervical zona pellucida may be absorbed by too many body fluids, which will affect the test results. Therefore, it is best for pregnant women to do nt within 1 1~ 14 weeks of pregnancy, so as not to check the results.

3.nt had better make an appointment in advance. Generally, you can make an appointment for hospital scheduling at 1 1 week before pregnancy. Don't make an appointment after pregnancy 13 weeks, so as not to queue for too long. Doing NT beyond gestational age will affect the accuracy of the test results.

Nt is fine, generally non-invasive, no problem. What is the function of 3 NT exam?

NT is an abbreviation of translucency, which refers to "transparent layer of neck", that is, the maximum thickness between skin and subcutaneous soft tissue on the plane of concern of fetal cervical vertebra. NT test aims to determine this index.

The zona pellucida behind the neck is the liquid accumulated under the skin of the baby's back neck after 10 ~ 14 weeks of pregnancy, which can be measured by ultrasound. The purpose of nuchal translucency examination is to diagnose chromosomal diseases in early pregnancy and find fetal abnormalities caused by various reasons.

The results showed that during the pregnancy of 1 1~ 14 weeks, if the fetus is down syndrome or cardiac dysplasia, the transparent layer of the neck will thicken. The thickening of nuchal translucency is related to structural abnormalities such as fetal karyotype and fetal congenital heart disease. The thicker the transparent layer of the neck, the greater the probability of fetal abnormality.

The high-risk groups that need cervical zona pellucida scanning are: expectant mothers, elderly women (over 35 years old) who have taken bad drugs in the first trimester, who are worried about the impact on the fetus, those who have given birth to deformed children in the past, who have miscarried many times, or those who have given birth to children with chromosomal abnormalities and mental retardation at home, so they should go to the maternity hospital as soon as possible for accurate examination.