To see the urology, most cases do not need to fasting, but a few cases such as for urography, urography need to fasting. 1. The tests that do not require fasting are: urological examination, including ultrasound, CT, MRI, etc.. One of the urological ultrasound need to fill the bladder is because after the bladder is full in the liquid under the control of the surrounding tissue structure in order to show clearly conducive to the discovery of abnormalities and foci. So there is no need for fasting in this case. 2. The tests that require fasting are: urography, imaging and so on. (1) urography: that is, X-ray film, to check whether there is a positive urinary stone, not only need to fasting, it is best at the same time will be the accumulation of fecal matter, the accumulation of gas drainage. (2) Imaging: Imaging requires fasting as well as urography because of the increase of gas in the intestines after eating and the possibility of producing stools, which can interfere with the results of imaging exposure under X-ray. If you have any discomfort, please go to the urology department of a specialized hospital for treatment, and consult your physician for details.