NT is a posterior nuchal translucency scan, and the fetal heart rate is usually 110 to 160 beats per minute at the time of the NT test. The NT test is one of the routine tests during pregnancy and is usually performed during the 11th to 14th week of pregnancy to determine the thickness of the fetal posterior nuchal translucency zone by ultrasound. The normal range of fetal heart rate is 110 to 160 beats per minute throughout the pregnancy, so the fetal heart rate is generally 110 to 160 beats per minute during the NT test, and there is no risk of abnormal fetal heart rate results due to the NT test. According to the fetal heart rate, it is possible to understand the reserve capacity of the fetus and the state of the fetus in the uterus, and it is possible to observe whether there is any hypoxia in the fetus. If the fetal heart rate is more than 160 beats/minute or less than 110 beats/minute, it is considered that there is intrauterine hypoxia, the causes of which include insufficient oxygen in maternal blood and fetal diseases. You should have regular checkups during pregnancy and seek medical advice as soon as possible if you feel unwell.