4-D inspection how long to make an appointment in advance

Four-dimensional examination in advance how long to book this time is not necessarily, because each hospital situation is different, some finished down screening on the direct appointment, some about a month in advance appointment, some about a week in advance appointment, specific according to the doctor's requirements to do it. General four-dimensional examination in pregnancy around 24 weeks, as long as not delay normal examination time can be. Four-dimensional examination is very important for screening whether there are external or internal abnormalities in the fetus. The examination is chosen at about 24 weeks because the limbs of the fetus are fully developed at this time. The fetal size and amniotic fluid are also relatively moderate, and the imaging can be clearly seen. Therefore, it is necessary to do four-dimensional examination according to the doctor's requirements. According to the doctor's advice, make an appointment in advance.