From the first moment of the baby's arrival in the world, parents make a wish in their hearts, hoping that the baby will develop normally after birth, healthy and healthy birth, so for a small wish, pregnant parents will pay a lot of efforts, do a lot of tests, such as NT...
Mom-to-be moms and dads who don't know can learn more about NT through the following!
What is an NT test? NT examination is actually a fetal cervical transparent layer examination, which refers to the maximum thickness of the soft tissue between the skin layer and the fascia layer on the back of the neck of the fetus, which is one of the screening items in the first trimester.
NT tests were originally used for down syndrome (trisomy 21) and are currently used for trisomy 18 (i.e., Edwards syndrome) and trisomy 13 (patens syndrome), and can also take into account the prediction of pregnancy hypertension and preterm birth after the test. In addition, NT tests can also screen the fetus for major deformities in the hands, feet, and other parts.
The best time for NT examination The NT examination time is best controlled at 11 weeks to 13 weeks + 6 days, before 11 weeks, the machine is difficult to scan the thickness of the zona pellucida of the neck, and after 14 weeks, too much fluid will be absorbed by the fetal lymphatic system.
The normal value of NT examination is the zona pellucida posterior to the neck, and the general post-cervical zona pellucida is less than 2.9 mm. A thicker zona pellucida at the back of the neck does not mean that the baby must have a problem. Some normal babies also have more fluids. Although 2.9 mm is the upper limit of the normal range, there are nine times out of ten that babies with measurements between 2.5 and 3.5 mm are completely normal.
Is NT Check Important?
NT examination is also one of the diagnostic bases for early Down's screening, and the thickness of the skin behind the neck of the fetus is examined by color ultrasound, which is a routine test for screening chromosomal abnormalities and fetal malformations!
If the test results are greater than 2.5 mm, there is often a risk of adverse fetal conditions. Key records are needed to prompt doctors to focus on later stages of Down's screening, four-dimensional ultrasound and orratology examination, cardiac ultrasound, or chromosome examination.
What should I do before doing NT?
The NT test does not require special preparation, and you can eat breakfast without holding back urine.
However, the inspection has certain requirements for the position of the baby, and if the baby is in a position that is not easy to measure, it is easy to cause inaccurate measurement. In order to ensure the accuracy of the report, when the baby's position is not very suitable, the pregnant mother can go out and walk around more, or eat something to let the baby turn over and change positions.
The NT test can be done in about 10-30 minutes, and the time may be shorter if the baby cooperates well.