General NT value of 3.8mm non-invasive done low-risk does not matter, but also follow the doctor’s instructions to strictly carry out prenatal examination. NT refers to the thickness of the fetal nuchal translucency, which is an ultrasound test for screening chromosomal abnormalities in the fetus during early pregnancy, with a normal value of <2.5mm. When the NT value is 3.8mm, prenatal diagnosis is recommended to clarify the risk of fetal morbidity, but when non-invasive low-risk is done, it usually does not matter, but also follow the doctor's instructions to strictly carry out labor and delivery tests. Non-invasive prenatal testing is a prenatal screening method. Positive results indicate an elevated risk of fetal morbidity and require amniocentesis, prenatal counseling, and prenatal diagnosis as prescribed by the doctor. However, when the result indicates a low risk, it does not necessarily mean that the fetus is developing normally, and screening for fetal structural abnormalities and subsequent prenatal testing should be performed.