predestination - previous determination as if by destiny or fate. doom, doomsday, end of the world, day of reckoning - an unpleasant or disastrous destiny; everyone was aware of the approaching doom but was helpless to avoid it; that's unfortunate but it isn't the end of the world.
That is 2 1/2 hours! Average is 3 hours now from start to finish. THEN we have to wait for the scan to be sent to the radiologist, and when he/she calls back, we can dispo the patient. I can't believe that every CT done in this country for a possible appy or whatever takes over 3 hours.
When you schedule a PET-CT scan, the staff will tell you how to get ready. For example, you might need to drink only clear liquids after midnight the night before the scan. Or you might need to stop eating and drinking at least 4 hours before the scan. Ask a member of your health care team.