Patients should inform their doctor if they are pregnant or have any allergies to iodine or other substances before undergoing the test. They may also be asked to remove any jewelry or metal objects from their body before the test. Depending on the individual’s situation, specific preparation may be required before the test. It is important for patients to follow any instructions given to them by their healthcare provider. In rare cases, the contrast dye may cause an allergic reaction or other adverse effects, so patients should inform their healthcare provider if they experience any symptoms such as itching, hives, or difficulty breathing during or after the test.