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The most serious risk from this test is bleeding. Many patients have a small amount of bleeding into the space around the kidney, but in a few patients this can be significant enough to require a transfusion and, in rare cases, even surgery. Somewhere between 1 and 3 patients out of every 1,000 have serious bleeding that requires a transfusion.

Almost all patients have some bleeding into their urine that can be seen with urine tests under the microscope. About 1% of patients have enough bleeding into the urine that the color of urine changes from yellow to a red color. The bleeding into the urine is almost always temporary.

It is possible, but unlikely, that you will develop a kidney infection after this test. Most patients have a small amount of soreness in their back for a day or two where the needle was placed.

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