Ultrasound examination uses high-frequency sound waves to clearly display the internal tissues and organs of the human body in cross-sectional image, the image is rich in solid sense, easy to observe the tissue morphology, and can be used for the early diagnosis of a variety of diseases, the clinical application is extremely wide, for the liver, gallbladder, kidney, bladder, uterus, ovaries, prostate and other solid organs with a clear interface, there is no radiation, safer. The advantages of this examination are extremely obvious, which are instantaneous imaging, easy operation, no radiation, and low cost. The disadvantages are limited accuracy, inability to penetrate bones and air, and misdiagnosis due to false reflection phenomenon. Of course, nowadays, with good instrumentation, ultrasound is also very advantageous for cavity organ examination, especially for neonatal gastrointestinal and intestinal examinations, which have become the preferred items. Before performing ultrasound examinations, you need to understand the relevant examination requirements and cooperate with the doctor to prepare for fasting or bladder filling to avoid any influence on the examination results. In addition, the national law clearly stipulates that non-medical needs for fetal sex determination are strictly prohibited, so pregnant women are advised not to make relevant requests during ultrasound examinations.