The cost of a hospital NT test is actually not very high, but slightly more expensive than a regular ultrasound. Generally, an ultrasound is done at about 7 weeks of gestation to check for intrauterine pregnancy and fetal heartbeat, and after the test, the doctor will instruct the mother when to have the NT test. The NT test requires special qualifications for the ultrasonographer and not every doctor can do it. Therefore, many hospitals can only perform the NT test from Monday to Friday, and may not be able to do it from Saturday to Sunday. In addition, the NT value test requires the child to be in a special position and does not require an empty stomach, so you must eat before the test. The ultrasonographer will instruct the pregnant woman to eat well, and the examination may take a little longer. It is most important to pay attention to the examination time, do not exceed the gestational week, more than the gestational week will miss the period, resulting in the inability to do the examination again.