A KUB (kidneys, ureters and bladder) is an abdominal x-ray performed to look for problems with the kidneys or bladder.
The test can be useful in evaluating pain in the lower back on either side of the spine that may be caused by certain urinary tract problems.
What to expect:
You will lie on your back on an x-ray table. After the x-ray machine is positioned over your abdomen, you will be asked to hold your breath and lie still while the x-ray pictures are taken. Sometimes only one picture will be taken while you are lying on your back. (This is the supine abdominal or KUB x-ray.) However, sometimes two pictures may be taken: one while you are lying down (supine view) and one while you are standing (erect view).