Is four dimensions the same as big row?

Four-dimensional color Doppler ultrasound is one of the large row examination. To do row examination in the early stage need to do NT do Tang screen, and then do four-dimensional color Doppler ultrasound, after these row examination can know the fetal development, if the problem can be further examined, such as do sugar screen if it shows high risk then need to do amniotic fluid puncture or non-invasive DNA, because amniotic fluid puncture has a certain risk, easy to show abortion situation. Therefore, in order to prevent this from happening, non-invasive DNA is needed. Although non-invasive DNA is not as accurate as amniotic fluid puncture, it can also be roughly inferred. If non-invasive DNA is used, the problem is more serious. There is no way to continue pregnancy. Abortion can be performed to terminate pregnancy.