NT Check Notes

NT examination is one of the most important and necessary examinations during pregnancy. This examination is to see whether the fetal skull development is normal and exclude anencephaly. The most important thing is to measure the thickness of subcutaneous fat behind the neck of the fetus. The normal value is 0.25 cm. If it is greater than 0.25, it is recommended to do non-invasive DNA or chromosome karyotype analysis to prevent fetal development abnormalities. Nt test is mainly an initial Down's screening, to determine the thickness of the fetal neck transparent zone, so to judge the fetal development. Generally, it is performed between 11 weeks and 13 weeks plus 6 days of pregnancy. If it is too late or too early, it will affect the test results. At the same time, it is not necessary to maintain an empty stomach before the test, which is not conducive to the accuracy of the test results.