The nt value refers to the thickness of the fetal nuchal translucency measured by ultrasound, if this value is greater than 3mm, it suggests that the fetus has abnormal development, or the possibility of malformed fetus. nt value is high and the sperm has a certain relationship, if the quality of sperm is not good, and at the same time carries abnormal chromosomes may cause the nt value to be higher. A normal fetus will have a temporary increase in nt value during development, and it will return to normal after 14 weeks as the child grows and develops, so you can observe it for a while. It is also possible that a woman may be injured by a virus or radiation during pregnancy, causing the fetus to develop abnormally or malformations causing an increase in the nt value. Fetuses with congenital heart disease may also have mildly elevated nt values on ultrasound.