The NT test, also known as posterior nuchal translucency scan, is an important indicator of the presence of fetal malformations and is mainly used to assess whether the fetus has Down’s syndrome, with a high accuracy rate. Therefore, it is necessary to adjust the fetal position during the examination. Therefore, it is necessary to adjust the fetal position properly during the examination, as the incorrect position may affect the normal examination results. Usually, the pregnant woman is required to adjust the fetal position by walking around herself to cooperate with the examination. Sometimes the pregnant woman can also change the fetal movement by turning over or the doctor tapping the pregnant woman’s abdomen. The NT test is performed at the best gestational age (11-13 weeks + 6 days), but too early or too late may affect the test results. In addition, NT test is more important as the first screening test, pregnant women need to relax and cooperate actively. When walking, you should pay attention to safety and try to be accompanied by your family.