How many months of pregnancy should I do NT examination

The NT test is to accurately measure the thickness of the fetal nuchal translucency layer, which is usually performed between 11-14 weeks of pregnancy with higher accuracy. If the test result exceeds 3mm, it means thickening, indicating that the incidence of fetal malformation and chromosomal abnormalities will increase, and further invasive DNA or amniocentesis tests are needed. Based on the test results, determine whether to terminate the pregnancy. Patients are advised to go to a regular hospital for examination, which is safer. Pay attention to daily medical care during pregnancy to ensure the healthy growth and development of the fetus.

NT test can be done when the pregnancy is 11 weeks to 13 weeks. If the time is shorter or the fetus is smaller, it cannot be seen clearly. If it exceeds 136 weeks, because the fetal lymphatic system is fully developed, lymphatic return will be smooth and accurate measurement results will be impossible.

The NT test is to accurately measure the thickness of the fetal nuchal translucency layer. If it exceeds 3mm, it is thickened. The incidence of fetal malformations and chromosomal abnormalities will increase significantly. The next step is to do a minimally invasive DNA test or directly do an amniocentesis test. Based on the results of the amniocentesis, it will be determined whether to terminate the pregnancy.

For expectant mothers with regular menstrual cycles, ultrasonic prenatal diagnosis, which we call NT, can be performed at 11 weeks to 13 weeks and 6 days of pregnancy. Malformations that can be screened out during this period include anencephaly, holoprosencephaly, encephaly, limb abnormalities, and NT thickening. The normal NT is no more than 3 mm. 50% of trisomy 21, 25% of trisomy 18 and 10% of Turner syndrome have thickened NT. For older pregnant women over 35 years old with high risk factors for Down syndrome, if the NT is greater than 2.5mm at 11-12 weeks of pregnancy, it is considered to be abnormal thickening. If the fetus's NT is found to be thickened, attention should be paid to whether the bridge of the nose is missing or too short, and whether there is tricuspid regurgitation. If NT thickening is found, amniocentesis is recommended.