It is possible to have an NT test either in the morning or in the afternoon. NT test is often used clinically as a means of screening for fetal malformations during early pregnancy. The test is performed by ultrasound to measure the thickness of the fetal nuchal translucency band, which can generally diagnose fetal chromosomal abnormality risks or congenital malformations, etc. There is no obvious difference between the morning and afternoon of the test, both are possible. NT examination is only suitable for early pregnancy, usually from 11 weeks to 13 weeks + 6 days, if you miss this time, you can not be measured again. It is recommended to go to the hospital regularly for NT examination to avoid missing the time, and consult the doctor before the examination to prepare for the matters.