Ultrasound of the urinary system can check whether there are abnormalities in the shape of the kidneys, but not in the function of the kidneys. Through ultrasound examination, it is possible to understand whether the kidneys have increased in size or atrophy, and to check whether there is fluid in the kidneys, whether there are stones in the kidneys, whether there are tumors or cysts in the kidneys, etc. It is also possible to further determine whether the echogenicity of the kidneys is uniform and whether the blood flow in the kidneys is normal, and it is also possible to understand whether there is fluid around the kidneys and whether there are abscesses. However, it is not possible to directly determine whether the kidneys are functional, whether there is renal insufficiency or renal failure through the urological ultrasound. To determine the function of the kidneys, we need to supplement the kidney function test or nuclear scan of the kidneys to further clarify the problem. Therefore, to check the kidney problems, we need to conduct a comprehensive examination, including urological ultrasound, kidney function test and nuclear imaging, etc. to make a comprehensive judgment.