When the dye first begins to enter the bladder, an urge to urinate occurs. The technologist will stop the flow when the pressure becomes uncomfortable. The urge to urinate will continue throughout the test. After the test, the urethra may be tender during urination. There is some risk of infection from the catheter.
Radiation exposure is similar to other X-rays.
As with any radiation exposure, nursing or pregnant women are usually not recommended to have this test unless it is determined that the benefits outweigh the risks. This test is not performed very often any more.