Normal values ​​for nt test at 13 weeks

The NT test is actually one of the diagnostic bases for early Down syndrome screening. Through this test, we can know whether there are any abnormalities in the fetus. The best time for nt examination is between the 10th and 14th weeks of pregnancy. So, when doing NT examination in the 13th week, what kind of values ​​are within the normal range? Generally speaking, the normal value range of NT examination is less than 3mm.

The nuchal translucency is referred to as NT, which refers to the thickness of fluid accumulation in the subcutaneous tissue at the back of the fetal neck.

Pregnant mothers do not need to make special preparations for the NT test. They can eat breakfast. Because it is an abdominal color ultrasound examination, they do not need to hold their urine, which is quite a blessing. However, if the baby does not cooperate and is in a bad position, it will not be possible to see. We usually ask the pregnant mother to go out and walk around and then come back. Sometimes we will press your stomach very hard. Don't be afraid. This is usually because the child has fallen asleep and is in a bad position. The doctor needs to wake him up and ask him to turn over. The entire examination takes about 10-20 minutes, and it may be shorter if the baby cooperates well. Therefore, the only thing pregnant mothers should pay attention to before doing the NT examination is to maintain a good mood and talk more to the baby. Although the baby is still very small at this time, the baby can still feel the mother's love.

Both NT screening and Down syndrome screening are used to understand the health of the fetus, so both examination methods can screen the health of the fetus at an early stage.

NT screening refers to the thickness of the nuchal translucency and the serum test of pregnant women. The nuchal translucency refers to the space where water accumulates under the skin behind the fetus' neck. During an ultrasound scan, the doctor will measure the thickness of the space between the skin and tissue in detail. The nuchal translucency will be significantly thickened in fetuses with chromosomal abnormalities, especially in babies with Down syndrome. Down syndrome is usually more likely to occur in older mothers.

Down syndrome screening is a detection method that extracts serum from pregnant women, tests the concentrations of alpha-fetoprotein, chorionic gonadotropin and free estriol in the maternal serum, and calculates the risk of giving birth to a fetus with congenital defects based on the pregnant woman's due date, weight, age, weight and gestational age at the time of blood collection. The best time to do Down syndrome screening is between 15 and 20 weeks of pregnancy.