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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.
The PET scan is able to measure blood flow, oxygen use, glucose metabolism (how your body uses sugar), and much more. A PET scan is typically an outpatient procedure, meaning that you will be able to go about your day after the test is complete.