An NT does not require the removal of pants and can be done by transabdominal ultrasound. If the fetus is not in a good position and the transabdominal ultrasound does not show the plane of the NT well, then it needs to be done transvaginally and you need to take off your pants.
The NT (nuchal translucency) test is done at 11-13+6 weeks of gestation and can be done by holding your urine for the abdominal ultrasound.
The NT test is an early pregnancy ultrasound that measures the thickness of the fetal nuchal translucency to screen the fetus for the risk of aneuploid chromosomal disorders, mainly Down’s syndrome. It can also be combined with early pregnancy serologic tests such as related plasma protein-A and free beta-human chorionic gonadotropin to increase the rate of positive screening.
However, a negative NT result is only indicative of a low risk of the disease, not normal, and regular labor and delivery testing is required. A positive result does not confirm the disease, but only suggests that the fetus is at high risk for the disease, and genetic counseling and other prenatal diagnostic procedures should be performed as prescribed by the doctor to clarify the disease as early as possible.