The need to hold urine for abdominal CT needs to be analyzed on a case-by-case basis. For abdominal CT, urine holding is usually not required for digestive system and hepatobiliary system examinations. For urinary system examination, it is usually necessary to hold urine, depending on the patient’s examination site. For abdominal CT examinations, different preparations are required depending on the content of the examination. The abdomen includes the digestive tract, liver, gallbladder, pancreas and spleen, the urinary system and the reproductive system. CT abdomen can examine the digestive system, the liver and gallbladder system, as well as the urinary system and also the reproductive system. If you do digestive system and hepatobiliary and pancreatic examination, you usually do not need to hold urine, but you need to examine in a fasting state. It is better to start fasting the night before the examination, so that you can see the specific situation of the gastrointestinal tract and the location of the lesion, and you can also understand the shape and size of the liver as well as the gallbladder. In the case of urinary tract diseases, it is usually necessary to hold urine, and the examination can be performed with a full bladder to understand the situation in the bladder and to screen for bladder polyps, bladder stones, bladder cancer, etc., and also to understand the condition of the kidneys. Therefore, whether or not to hold urine for an abdominal examination should be determined by the examination site.