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Intraveneous pyelogram (IVP) is a series of X-rays of the kidney, ureters, and bladder with the injection of a contrast dye into the vein. The images are used to detect tumors, abnormalities, kidney stones, or any obstructions, and to assess renal blood flow. It may also be used to evaluate other diseases or check for spread of bladder cancer to other areas of the urinary tract.