The NT value of 1.6mm is a normal value, which means that there is no abnormality in the embryo development, normally you can go to the hospital for NT test when you are 11-13 weeks plus 6 days pregnant, NT is the thickness of the zona pellucida behind the neck to determine the embryo development, the thickness <3mm is normal, >3mm indicates the possibility of Down’s syndrome or chromosomal abnormality. At this time, early and mid-term screening must be done in the hospital to see the embryonic development, so the NT value is less than the normal value is mostly normal, indicating that there is no problem, if the higher the NT value, the greater the risk factor. Therefore, the NT value of 1.6mm indicates that it is within the normal range and is a normal value.