A KUB (Kidney, Ureter, Bladder) plain CT scan is a radiographic examination that combines a plain CT scan of the abdomen with a contrast-enhanced CT scan of the kidneys, ureters, and bladder.
The plain CT scan, also known as a non-contrast CT scan, is performed first. It involves taking images of the abdomen without the use of any contrast material. These images provide an initial evaluation of the size, shape, and position of the kidneys, ureters, and bladder. They can help identify any abnormalities or conditions such as kidney stones or urinary tract obstructions.