Many pregnant mothers have such doubts during pregnancy tests. The detection rate of NT is low, and the detection rate of Tang sieve is not high. Then can I just do the Tang screen in the back instead of NT?
Although we generally recommend a complete pregnancy test, we can rest assured, but as far as the accuracy of risk assessment is concerned, it is still possible to only do Tang screening.
How to screen Down's syndrome ① The NT value is 0.3-0.6cm, the fetus 10% may be Down's syndrome, the NT value is above 0.6cm, and 85%-90% may be Down's syndrome.
② If NT is at high risk, further Tang screening should be done; If the Tang screening value is less than 1:270, it needs to be non-invasive; In the range of1:270-1:1000, non-invasive is recommended. If the risk is low, it can be observed dynamically later.
(3) If there is no high risk, it is necessary to further make sheep wear.
Seeing this, some pregnant women may think, then I might as well do sheep puncture directly, with high accuracy. Even so, according to these tests in the process of screening children with Down's syndrome, the cost is from less to more, that is, sheep puncture is the most expensive, and the risk value is from low to high, that is, everything else is non-invasive, and sheep puncture has the risk of infection and abortion. Although the probability is small, it is also a risk in comparison.
Can I just make Tang sieve instead of NT? Sure! NT evaluates the risk of Down's syndrome by looking at the thickness of the zona pellucida behind the neck of the fetus, while Tang Sieve takes the venous blood of pregnant women, and then calculates the relevant value according to the weight, expected date of delivery and age of pregnant women.
Except for the different examination time, nt needs to be done in1113 weeks +6 days, and Tang screening needs to be done in 14-20 weeks, which has similar significance. It is used to evaluate the risk value of fetal Down syndrome, and the detection accuracy is not high.
Although the accuracy of NT and Tang screening is not high, it is recommended that pregnant mothers with conditions do it. In addition to low cost, there are subtle differences between these two specific tests. In order to get through pregnancy with peace of mind, it is always not a bad thing to do more tests.
I often hear this question in the clinic. Let me answer you first. This is possible. You can do Tang screening directly in four months.
I'll tell you what NT is first. This is by observing the transparency behind the fetal neck and the amount of lymph behind the fetal neck. If this value is greater than 0.3 cm, it means that the risk of Down syndrome is greater. Down's screening is to calculate the risk value of Down's baby, not a definite value. During the period of 14 to 20 weeks, the blood of pregnant mothers was taken, and the risk value of Down syndrome was calculated according to alpha-fetoprotein, maternal weight, blood sugar and age.
Can those two tests be replaced by one? If you have to choose, you can do Down's screening for four months without NT. However, it is recommended to combine the two tests for screening. Because the screening of NT and Down is a risk assessment, neither of them is 100% sure. If you want to be 100% sure whether it is Down's syndrome, you need to have an amniocentesis. Some people will ask, do you have to choose one of these two tests? Down's screening is recommended.
Next, I will introduce you to the screening process of Down's children. The first is NT. If the value is greater than 0.3 cm, Down's screening is required. If Down's screening value is less than 1:270, non-invasive DNA needs to be completed; If it is between1:270 ~1:1000, it is recommended to do non-invasive DNA. If non-invasive DNA is a high risk, amniotic fluid screening is needed, which is an invasive examination. Many people will ask, why don't hospitals do amniocentesis directly? There are several reasons why hospitals don't do this test directly. First, expensive. Secondly, amniocentesis is an invasive examination with the risk of abortion. The final accurate value of step-by-step screening is also high.
If conditions permit, it is recommended to do both NT and Down's screening.
Can you let Tang Sie directly for 4 months without NT?
Yes, nt is not needed everywhere, because its effective examination time is in the first trimester, and many expectant mothers miss NT examination directly without knowing that they are pregnant.
NT examination is to scan the thickness of transparent layer of fetal neck with B-ultrasound at gestational age113. If the result of this test is 3, it means that the fetus may have Down syndrome.
Four-month-old Tang screening, except for elderly women or some special pregnant women, is generally done, and this is a self-funded inspection project, and some rural areas or communities will give appropriate subsidies.
How to do Down's screening?
The best screening time for Down syndrome is between16 and18 weeks of pregnancy. By taking venous blood from the expectant mother's arm, the chorionic gonadotropin in the blood is detected, and then the probability of Down syndrome is calculated by combining the menstrual period, height and weight of the expectant mother.
The results of Down's screening are divided into low risk and high risk. If it is high-risk, it needs to be further diagnosed by non-invasive or sheep puncture. However, as long as you are healthy, the accuracy of this high risk is not high, so expectant mothers don't have to worry. Usually, the risk of re-diagnosis is low.
Once a mother-to-be told me that since the accuracy of Down's screening is not high, can we do it directly without Down's screening? Of course, but the price of non-invasive is relatively expensive, generally around 2000, which is not affordable for all families, and not all cities have non-invasive services. Down's screening can be done in many hospitals as long as it is basically acceptable within 200 yuan.
However, prenatal examination during pregnancy has different pertinence according to different gestational weeks. Expectant mothers are advised not to delete prenatal examination items at will, and it is best to follow the doctor's advice.
Don't do NT, just wait for four months of pregnancy to do Tang screening, okay?
If conditions permit, nt is still recommended, but many pregnant mothers don't know that they are pregnant in the first trimester, so they miss the time to do NT. Therefore, pregnant mothers do not do nt, and it is also possible to wait until the fourth month of pregnancy before doing Tang screening.
NT is also one of the items of prenatal examination, also called screening at the beginning of Tang Dynasty. The risk of Down's syndrome was assessed by scanning the thickness of the zona pellucida in the fetal neck.
If the NT value is less than 2.5 mm, it is normal, and if the NT value is greater than 2.5 mm, it is a high risk of Down syndrome. Doctors may advise pregnant mothers to do non-invasive or direct amniocentesis to continue the diagnosis, so as to judge the development of the fetus more accurately.
Tang screening mainly determines whether the fetus is a high-risk group of Down syndrome by detecting the risks of 2 1 trisomy, 18 trisomy and NTD. If it is a high risk, the doctor will advise the pregnant mother to do non-invasive or amniocentesis.
Tang sieve, also known as middle Tang sieve, has its limitations in accuracy, but if both early and middle Tang sieves are made, the accuracy will be higher. I hope pregnant mothers will have a checkup on time and give birth to a good baby!
It is also important to suggest that the examination items listed by doctors should be completed step by step, and NT value can be used as the reference value for the next Down's screening. I have been doing nt for more than time, so the critical risk of Down's screening can't refer to NT value. I made a non-invasive diagnosis.
NT is the thickness of the transparent layer behind the fetal neck. At the beginning of pregnancy, because of some metabolism in his body, there will be a thin transparent layer like a water bag at the back of the fetal neck. By detecting its thickness, the B-ultrasound doctor can preliminarily judge whether the fetus has metabolic abnormalities. The exam usually takes 10- 13 weeks. If the thickness exceeds the normal value, the doctor will get pregnant and the child will get Down syndrome.
When I was pregnant with a baby, nt was in 13+4, and my Down's screening was a key risk. The doctor said that noninvasive DNA or amniocentesis is recommended.
I spent 1800 yuan on non-invasive DNA, so amniocentesis will be more expensive. The doctor advised me to do it noninvasively. She said that because I didn't do it in the right pregnancy cycle, it couldn't be used as an accurate reference. If the reference value of NT is valid and normal, she can combine the results of Down's screening to decide whether to carry out non-invasive examination. The problem is that the value of the new Taiwan dollar can't be used as her reference. To be on the safe side, she can only advise me to take a non-invasive approach. Amniocentesis carries the risk of miscarriage.
If Down's screening is low-risk, many people will think nt is unnecessary, and it is not wrong for township hospitals not to do these tests, but in my case, it costs money to do non-invasive.
The doctor said that if you don't make a non-invasive diagnosis, you should make another three-dimensional color ultrasound diagnosis, for fear that the baby will be older at that time. If there is a problem, will you stay? And during this period, pregnant women will be very unstable. As soon as I heard the doctor say this, I couldn't control my tears. Call the husband who is at work to explain the situation and immediately confirm that there is no trauma after two days. The long wait is very painful.
Pregnancy in October, pregnancy test is also a long way. For the sake of the health of the fetus and the less suffering of pregnant mothers, it is recommended to follow the pregnancy test project.
Can I have Tang Sii for four months without nt? Of course, even if you don't do Down's screening, you can have children without NT before, but without NT, the birth defect rate will increase relatively. In order to understand this problem, let's first understand the role of NT.
What does NT do? NT is the thickness of transparent layer of fetal neck, and its main function is to screen chromosomal abnormalities of fetal aneuploidy, the most common ones are 2 1- trisomy and fetal heart abnormalities. Moreover, NT occurred in 1 1- 13+6 weeks, and the detection rate of 2 1- trisomy was about 60%. Also called early screening.
What is the purpose of mid-Tang screening? The screening in the middle Tang Dynasty mainly includes 2 1- trisomy, 18- trisomy and neural tube defect screening. The detection rate of 2 1- trisomy is about 65%, which is consistent with the detection rate of nt. The screening time in the middle Tang Dynasty is 15-20 weeks. The time of amniocentesis is 18-24 weeks, or 16-22 weeks. There are some differences between different hospitals.
For the current view, it is suggested to do nt examination in the first trimester, so that fetal abnormalities can be found early. If the fetus is abnormal, amniocentesis or villus collection can be done in advance. NT combined with Midtang can also improve the detection rate of 2 1- trisomy, which is about 85%.
If you have the conditions, then it is recommended to do NT. If you don't have the conditions or miss NT, then do mid-Tang screening.
As an obstetrician, I actually prefer to do a non-invasive DNA test rather than a routine screening in the middle Tang Dynasty. After all, the detection rate of 2 1- trisomy in non-invasive DNA examination is higher, above 90%. Good luck with your pregnancy.
Yes, you can. When I was pregnant with the boss, I had never heard what nt was, and it was made directly.
Now pregnant with a second child, I knew that there was such a test, so I did it obediently.
It is also possible to make Tang sieve directly without NT, but it is not recommended. Since there is an exam, it must be meaningful. And these tests are all for the baby in our belly, so as to minimize the probability of problems. Therefore, prenatal examination must not be afraid of trouble, and all the examinations should be done. After all, the baby's health is more important than anything else.
Usually, when you file for the first time, the doctor will advise you to do NT. In fact, this is the earliest Tang screen. Wait until 16 weeks, and the doctor will ask you to have a Tang screening. Tang screening high-risk people can suggest non-invasive or amniocentesis. For pregnant women over the age of 35, the doctor will directly advise you to do amniocentesis.
Last week, I just finished this examination because of my age. To tell the truth, it hurts a little, but it's totally tolerable. Moreover, amniocentesis is a free project in our local area, and it is still very humanized. At least, after this, you can basically rest assured.
Pregnancy examination is particularly important. I hope every pregnant mother can pay attention to it and ensure the health of her child.
After pregnancy, for the sake of the baby's health and the health of pregnant women, every check-up during pregnancy is very important for us pregnant women. Expectant mothers should not take any chances. Recently, many pregnant women said that Tang screening can be done without nt. First of all, nt and Tang screening are two different tests, which I would like to share with you here.
Can you just let Tang Sie without nt?
Every check-up during pregnancy needs to go to the hospital, preferably nt. First of all, we clearly know that nt is to check the thickness of the transparent layer of the neck and screen neurovascular defects in children at an early stage. Down's screening is a blood test, which is to screen children for congenital stupidity. 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. Therefore, expectant mothers should be clear about what items they need to check at the best time in the early stage.
What's the difference between Nt and Tang Ping?
These two checks are different anomaly checks. The former nt is a super-class color ultrasound examination, and Down's screening is a blood test. The time requirements of the two exams are also different. Nt was examined at 12 weeks, and Down's screening was examined at 16 weeks. Every time you check, you should check according to the pregnancy checklist and be a responsible expectant mother.
The above is a brief explanation I shared with you. Can I just do Tang screening without nt? I hope every mother has a healthy baby, provided that we keep a good mood, let the prospective father take action, accompany the pregnant mother to do various tests at a reasonable time, and wait for the arrival of the baby together.
Let me share my baby's literacy experience with you. My baby started reading with him at the age of 3, but my children don't like books that don't move much. Later, I began to look for animation education materials, and used many kinds of early education applications before and after. Advertisements are frequent, and children begin to charge if they don't know the learning effect, until they find that Maoshuai's literacy application can accumulate literacy, develop good reading habits and quickly adapt to young convergence.
Our maternal and child health hospital here must do NT for three months, and then put it on record after seeing the results.
Can I have Tang Sii for four months without nt?
Many pregnant mothers have these doubts about prenatal examination. Since they went to the hospital for prenatal examination, all kinds of examinations have been available, each with its own advantages. They can't rest assured until they have finished the inspection.
If conditions permit, it is best to do all of them, but if conditions do not allow, some of them may not be done, and the whole inspection will cost thousands of dollars.
When I was pregnant before, because I was poor, I saved prenatal examination. Because there is no family history in our family, my husband and I are both type O blood.
Therefore, in addition to the blood test in the early stage, my two pregnant children also had a B-ultrasound, and then they had a four-dimensional color Doppler ultrasound for more than 20 weeks. Later, they will be given ECG, fetal monitoring and oxygen inhalation.
I didn't do other tests. It's not that these tests are not good. The key is that my conditions don't allow it. At that time, I was from the countryside and didn't go to work. So I checked that all the items were normal and nothing else was checked. Personally, I have no bad hobbies!
For prenatal examination, do everything possible to reassure you!