A prenatal level iv ultrasound is a 4D ultrasound, and there is no need for a 3D test after having a prenatal level iv ultrasound. A 4-D ultrasound can be done at 22-28 weeks of pregnancy (most around 24 weeks) to rule out most malformations in the fetus. The IV ultrasound can provide a clearer and more comprehensive view of the dynamic three-dimensional structure of the fetus. If the IV ultrasound result suggests that there is no fetal abnormality, then there is no need to repeat the three-dimensional examination, and the ultrasound can be repeated as prescribed by the doctor during the subsequent pregnancy. During pregnancy, keep your mood happy, don’t be partial to picky food, achieve balanced nutrition, don’t overeat, eat less and more often, and increase nutrition. During pregnancy, you should do the obstetric examination on time and observe the condition of the fetus in all aspects. The specific examination time should follow the doctor’s instructions.