Also called excretory urography or IVP, this x-ray is used to evaluate the structure and function of the kidneys, bladder and ureters (tubes that carry urine from the kidneys to the bladder). It is most commonly used to detect obstruction, as in the case of kidney stones, or suspected tumors, cysts, or other conditions of the urinary tract.

Procedure:
 
• After positioning on an x-ray table, x-ray dye (contrast medium) is injected into the bloodstream and x-rays are taken at frequent intervals as the dye travels from the kidneys through the urinary tract.
• The abdomen may be compressed to restrict the dye to the upper urinary tract for the first part of the study.
• You will then be instructed to urinate, and another x-ray is taken.
• The test usually takes less than an hour to perform, although in cases of obstruction delayed films may be taken for several hours.

Risks:

• The contrast dye may produce a burning sensation and a fishy or metallic taste in the mouth.
• There is some risk of allergic reaction to the contrast.
• There is a small risk of excess radiation exposure (but not radiation sickness) if multiple x-rays are required


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