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NT examination is a color Doppler ultrasound examination, which measures the thickness of the posterior hyaline zone of the neck of the fetus under color Doppler ultrasound to check whether the fetus is at risk of malformation at this stage. It is an important diagnostic basis for early screening of Down's syndrome. The normal value of NT is less than 2.5mm. If it is greater than this value, it means that the fetus is at risk of malformation. Further examination and other tests are needed to make prenatal diagnosis. The higher the number, the greater the risk. NT test time is 11-13 weeks plus 6 days of pregnancy. This time is to be strictly observed, if you exceed this time, you may miss this very important test, is to be vigilant.