(Flat Plate of the Abdomen; Kidneys, Ureter, Bladder; KUB)
This test is an x-ray that uses radiation to take a picture of structures inside the abdomen.
Reasons for Test
This test is used when there is a concern that there is a problem in your abdomen. Some symptoms that may make your doctor concerned include:
- Nausea and vomiting
- Abdominal pain or side pain
- Blood in the urine
- Constipation or diarrhea
- Bloody or dark black stools
What to Expect
Prior to Test
You may be asked not to eat or drink anything for four hours before your test.
You will remove your clothes and put on a hospital gown. You will also need to remove all metal items, like jewelry and watches.
Tell your doctor if you:
- Have taken any bismuth medicines (such as Pepto-Bismol) within the last four days
- Had a barium contrast x-ray within the last four days
- Have an intrauterine device (IUD)
- Are pregnant or could possibly be pregnant
Description of Test
You will lie flat on your back under the x-ray machine and remain still while the x-ray is taken. You may be asked to shift to other positions for more x-rays.
You will be able to leave after the test is done.
How Long Will It Take?
About 10 minutes
Will It Hurt?
The x-ray may help your doctor find the source of your problem. If the x-ray shows an abnormality, you may need more testing, which may include:
American Urological Association
National Kidney and Urologic Diseases Information Clearinghouse
Canadian Health Network
The Kidney Foundation of Canada
The Merck Manual website. Available at: http://www.merck.com/mmpe/index.html.
The Patient's Guide to Medical Tests. Yale University School of Medicine; 1997.
Last reviewed October 2009 by
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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