Four-dimensional ultrasound examination charges are generally around 400 yuan, there is no such thing as high-definition, as long as the instruments that can carry out four-dimensional ultrasound examination are all high-grade. The level of diagnosis is mainly related to the level of the doctor and has little to do with the brand of equipment. Four-dimensional ultrasound is an examination that every pregnant woman needs to undergo in the middle of pregnancy, mainly after the basic development of fetal organs, through ultrasound three-dimensional representation of the development of fetal organs, whether there is any immaturity or deformity, and this examination is also able to respond to the activities of the fetus in the mother’s body, and the results of the examination are also relatively accurate. The best time to have a 4D ultrasound is around 5-6 months of pregnancy, and pregnant women need to make an appointment in advance.