The accuracy rate of 4D ultrasound is relatively high, but not 100% accurate. Four-dimensional ultrasound, or four-dimensional medical color ultrasound imaging technology can observe the dynamics of the fetus inside the pregnant woman in real time, and the doctor can also diagnose whether the fetus is congenital malformation according to the results of four-dimensional ultrasound. The accuracy of 4D ultrasound is affected by the week of pregnancy, the doctor’s experience, testing equipment and other factors, and will not reach 100% accuracy. 4D ultrasound is a systematic screening that can comprehensively observe the growth and development of the fetus in the uterus, conduct an all-around organ exclusion of the fetus, and observe whether there is any developmental abnormality in the limbs and spine of the fetus. It is recommended that pregnant women go to regular hospitals for 4D ultrasound examination during the appropriate period of pregnancy, so that problems can be detected and treated at an early stage.