What to Expect You will be asked to lie on a special DEXA exam table. The technologist will position you using foam blocks to keep you comfortable while holding the desired position correctly.  The arm of the DEXA machine will glide over your body capturing bone density measurement data used to create images and graphs of bone, fat, and muscle.  These results are reviewed and interpreted by the radiologist, and the report is sent to your healthcare provider for follow-up as needed. How to Prepare Do not take calcium supplements 24 hours prior to your exam. For 7 days prior to your DEXA, avoid any barium or contrast imaging studies associated with CT, MRI, and Fluoroscopy to prevent any residual barium from interfering with the exam. If you may be pregnant, please inform us before your exam begins. Consider wearing comfortable clothing that has no metal zippers or buttons in the abdominal or pelvic areas. You may also be asked to remove jewelry, eyeglasses, and any metal objects or clothing that might interfere with the images.