Firstly, you should inform your doctor if you are pregnant, breastfeeding, or have claustrophobia. Other than that, if you have any implants, pacemaker devices, etc., you should inform the staff or the doctor. You should leave all the jewelry and electronic devices at home. The test involves using contrast dye, so if you are allergic to it or have kidney disease, it is best to inform your radiologist or doctor. Other than that, you must also let them know about any medications you may be on.