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My grandfather's pet scan was only scheduled to take 1 hour, but instead it took 4 hours. Dr. Joseph Accurso Dr. Accurso. Not a bad sign: Generally, if a pet/ct scan takes longer than 1 hour, it is for technical or patient motion reasons. The camera might have had a problem, or the patient may have moved and part of the scan repeated, or more of the body (legs) imaged.
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.