“What is the prep for a CT scan?”

CT scan prep is different for different institutions and different imaged areas. There is usually none other than being off food and drink for a designated number of hours prior to the exam. This can help visualization of the gallbladder and help the patient avoid aspiration should the study require intravenous contrast. In the occasional patient, they may vomit in reaction to the contrast material. CTs are usually simple and fast exams that provide radiologists with a great deal of anatomical and at times physiologic information.

Harris L. Cohen, MD, FACR

That depends on the exact body part being evaluated by CT and whether contrast is being used.