KUB X-ray (kidneys, ureters and bladder)
Quick answer: A KUB X-ray is a single picture of the lower belly that shows the kidneys, ureters (the tubes from the kidneys) and bladder area. It is often used to look for kidney or urinary stones and to follow known stones over time.
- SampleImaging (no sample)
- TakesAbout 5 to 10 minutes
- Before the testNo special preparation is usually needed, but remove metal items from the area and tell staff if you might be pregnant.
How the test is done
- 1You remove metal items from your waist and may change into a gown
- 2You lie on your back on the X-ray table with your arms by your sides
- 3The machine is placed over your lower belly to cover kidneys to bladder in one picture
- 4You breathe out and hold still briefly while the picture is taken
What your results can mean
Reading your report
A radiologist reports on the images, and your doctor will explain what the findings mean for you.
If the result is outside the usual range
A KUB can show many kidney, ureter and bladder stones as white spots, and helps track whether a known stone has moved or grown. Some stones, such as uric acid stones, may not show, so an ultrasound or CT scan may be added.
Who usually has this test
People with sudden side or back pain that spreads to the groin, blood in the urine, or known kidney stones being followed up.
Risks and aftercare
There is no pain or recovery time, and the radiation is low; if there is any chance you are pregnant, let the radiographer know before the picture.
Names and options
Also called: KUB, X-ray KUB, kidney stone X-ray
Listed by the hospital as
- KUB DIGITAL X-RAY
Questions about this test
Can a KUB X-ray show all kidney stones?
No. Stones containing calcium usually show, but some stones are faint or hidden behind bowel gas. Your doctor may combine the X-ray with an ultrasound or order a CT scan if the X-ray is clear but symptoms continue.
What does KUB stand for?
KUB stands for kidneys, ureters and bladder, the three parts of the urinary tract the picture covers. It is a plain X-ray of the lower belly, without any dye.
Do I need a full bladder for a KUB X-ray?
Usually not, as the X-ray does not depend on the bladder being full. That is different from a kidney or pelvic ultrasound, which often needs a full bladder, so check which test you have been booked for.
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Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.