There are two types of NT tests: 1. The fetus may be in a bad position during the NT test, because the fetus is not in the right position for the spine to fit closely to the mother’s body, so it may not appear. The fetal spine is usually obvious during the NT examination, and the spine is the most important part of the fetal growth and development process, which can lead to abnormalities if it is not developed properly. The spine is the most important part of the fetal growth and development process. The fetal spine is the most important part of the fetal growth and development process, and if it is not developed properly, it can lead to abnormalities.