CT Whole Body (Head, Neck, Chest, Abdomen & Pelvis) With Contrast involves exposure to ionizing radiation and contrast dye, so it should only be performed when necessary. Pregnant women should avoid this test, as radiation exposure can harm the developing fetus. The patient may experience some discomfort or claustrophobia during the test, as they will be asked to lie still on a table that slides into a narrow tube. The contrast dye may also cause some side effects, such as nausea, itching, or a metallic taste in the mouth.