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Fasting or drinking only clear liquids is necessary for four hours before the test. However, sometimes the test done in an emergency even if the patient has eaten. The contrast solution contains iodine, to which some people are allergic. Patients who have allergies or hay fever, or have had a bad reaction to a contrast solution, should tell their doctor. A sedative, such as diazepam (Valium), may be prescribed to help the patient relax.
— Lori De Milto
