• Allergy to iodine-based contrast agent used to help visualize the area -- inform the health care provider if there you have allergies to seafood, as these may cause allergic reactions to the contrast agent.
• Allergy to anesthetic
• Bleeding
• Infection (urinary tract infection, pyelonephritis, or sepsis)
• Perforation (hole) of the ureter

This test should not be performed in people with acute urinary tract infection or obstruction at or below the biopsy site.

After the test, watch for abdominal pain, flank pain, or blood in the urine. A small amount of pink color is normal the first few times you urinate after the procedure, but grossly bloody urine or bleeding that lasts longer than three times urinating is significant.

Excessive pain, bleeding, fever, and/or chills should be reported immediately to your health care provider.