Do kidney color ultrasound can eat, but need to hold urine, because do not hold urine kidney color ultrasound can not see clearly, in the clinic only digestive ultrasound for examination can not eat, especially the liver and gallbladder system examination. Urological color ultrasound belongs to the examination means of urinary system diseases, can be used to check stones, occupation, such as polycystic kidney, renal cysts, renal occupation, etc., such as color ultrasound can not be clear, can further carry out the urological CT examination for clear diagnosis. Renal ultrasound belongs to a routine examination of the urinary system, if you consider kidney disease, you need to carry out this examination first.