A Kidney, Ureter & Bladder (KUB) x-ray enables assessment of the components of your urinary tract. It can be used to help diagnose urinary system disorders and the causes of abdominal pain. It can also be used to identify or diagnose calcifications (stones) in the kindneys and ureter, certain tumours and intestinal blockage in addition to allowing study of the size and position of your bladder, kidneys, and ureter.