AM scans, no solid foods after midnight before your test. PM scans, no solid foods after 6AM the morning of your test. Drink lots of fluids (water, coffee, or tea without cream or sugar) so you will be well hydrated for the exam. Please proceed with your regularly scheduled medications. No exercise for 24 hours prior to your appointment time (this can cause a false positive in your reading). There will be an hour delay from the time of the injection to the time of the scan.