Therefore, in order to have a good baby, try to avoid this situation and encourage expectant mothers to have a checkup on time.
Expectant mothers also attach great importance to it, but some of them are confused and don't know what it is and what they need to pay attention to.
For example, NT screening sounds professional. What is its function? Is it necessary to do it? The following knowledge should be understood.
What is NT screening? The Chinese translation of NT is the transparent layer of the neck, and the maximum thickness of the skin layer and fascia intermediate tissue on the back of the neck of the fetus is investigated, which mainly reflects the aggregation degree of subcutaneous lymph.
Simply put, NT screening is the first line of defense for fetal abnormalities, and it is used to screen whether there is Down syndrome.
It's different from B-ultrasound. Monitoring focuses on the possibility of chromosomal abnormalities in early pregnancy, which is conducive to timely detection and prevention of abnormalities. Pregnant mothers don't miss it.
Is it necessary to do NT screening? Doctors in China generally recommend that high-risk mothers with Down's syndrome have a scan of the zona pellucida behind the neck, for example, women over 35 years old have had the experience or family history of giving birth to Down's syndrome.
Although NT screening can't clearly judge whether the baby has pathological changes, it can be used as a preliminary screening to help the mother decide whether further diagnosis and examination are needed.
Moreover, some elderly pregnant women are pregnant with hysteromyoma, IVF and pregnancy difficulties. You need to do this check more. Compared with amniocentesis, it will increase the risk of abortion, and Down's comprehensive judgment of Tang sieve and nt results can also predict Down's syndrome well.
75% of Down's syndrome can be found and judged early in NT screening. Therefore, it is necessary to do this inspection, which is convenient to find problems and contain them as soon as possible. It is also an important means for families to eliminate risks.
In addition, NT can also screen out the precursors of the following diseases: such as fetal heart problems, which will be displayed in the data of the transparent layer of the neck. If the heart is overloaded, the thickness of the transparent layer will increase, so the lymphatic reflux will not be smooth.
Embryonic malformation usually occurs before 12 weeks of pregnancy. Because the baby has developed initially, problems can also be found early through NT screening.
When to do NT screening? Generally speaking, NT is best performed at 1 1- 13 weeks of pregnancy or 6 days after pregnancy.
Because the baby was young before 1 1 week, the data is not accurate. 14 weeks later, the baby's developing lymphatic system will also absorb too much fluid, which will affect the accuracy of the results.
However, due to inaccurate menstruation, delayed ovulation and mixed last menstrual time, it will affect the judgment of gestational age. Therefore, it is recommended to have an examination in the middle term, about 12 weeks.
In addition, it is more convenient to do this examination, without holding your urine and fasting.
Abnormal performance of NT screening results: We think that NT thickening is when NT exceeds 95% of the corresponding gestational age (95% is 95%(95% percentile, for example, measuring 100 people, of which 5% with the highest value is the critical point, and it is considered abnormal if it exceeds 95%).
However, if measured in different pregnancy, the abnormal tangent point value of nt is also different.
The thicker the NT value, the greater the probability of fetal malformation, but not all NT thickening is abnormal. When the thickness of NT is less than 3.5mm, there is a 90% chance of giving birth to a healthy baby. But if NT is greater than 6.5mm, the probability will be reduced to 15%.
Therefore, expectant mothers do not need to worry too much. Abnormal NT does not mean that there is something wrong with the baby, and further examination is needed.
Of course, it should be emphasized that this screening is not 100% accurate, and there must be no problem if NT is less than 3 mm Even pregnant women with normal results have a chromosome abnormality probability of 0.2%, which can be guaranteed to the greatest extent with the later systematic screening ultrasound, noninvasive DNA and Down's screening.
How should a mother avoid her baby's deformity? 1) school-age childbearing
The older the pregnant woman is, the more likely the baby will have genetic changes and chromosome variations.
Physiologically speaking, 23-30 years old is the most suitable age for childbearing. Women above this age need to have a physical examination with their other half before considering pregnancy.
2) Keep away from radiation sources
Stay away from radioactive substances, harmful chemicals, indoor environment with high formaldehyde content, polluted environment and food during pregnancy, and do not contact second-hand smoke and alcohol.
Pregnancy is a very difficult and painstaking process, but for the sake of the baby's health, we must pay attention to every examination. Finally, I also hope that expectant mothers can successfully pass the examination and welcome the birth of the baby as soon as possible.