Urologists are doctors who are concerned with the treatment of diseases related to the urinary system (also known as the excretory system) like kidney stone, pancreas problem, prostate cancer etc. They also deal with male reproduction system and are able take some tests such as CT scan, MRI or ultrasound as these tests allow them to check inside urinary tract. They also make use of a cystogram and can perform cystoscopy or a post void residual urine test and urine samples along with urodynamic testing.