You can eat during the pregnancy test for 4D ultrasound examination, but you should avoid eating too much so as not to cause stomach upset. The four-dimensional color ultrasound has added time dimension parameters relative to the three-dimensional color ultrasound, so it is also called real-time three-dimensional, which is equivalent to being able to record dynamic changes in the examination area. The best time to check is in the 22-26 weeks of pregnancy, when the fetal anatomy has been formed, the amniotic fluid volume is moderate, through the four-dimensional ultrasound can show the size of the fetus and clear images, can be timely found whether the fetus has facial deformities, cleft lip and palate, hydrocephalus, microcephaly, spina bifida, spinal bulge, intestinal dilatation, visceral ectropion, intestinal atresia, and megacolon, hydronephrosis, urethral obstruction, cleft lip and other pathologies, but also can be Observe whether the amniotic fluid volume of pregnant women is abnormal or not, which can be used to guide pregnant women to give birth. Fasting examination is prone to hypoglycemic reaction, so you can eat properly, and eat chocolate, cakes and other sweets, or by climbing stairs, walking and other activities can promote fetal movement, can be more clear, comprehensive observation of fetal growth and development, pay attention to avoid eating too much greasy, cold and irritating food can be. Before the examination, you can drink some water, so that the bladder is full, but also be able to observe the uterus more clearly, you can wear loose and comfortable clothing, easy for the doctor to check the operation.