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PET Scan Preparation :
PET scans are outpatient procedures that generally take 1 to 2 1/2 hours to perform. Patients are advised to wear loose, comfortable clothing; avoid eating for 4 hours prior to the appointment; and drink water before the appointment. Because the PET scan relies on glucose level activity, patients who have diabetes should consult a physician about how to control glucose levels during the procedure to avoid false test results.
It is important to arrive on time for PET scan appointments. The radioactive substance that is used has a short lifespan and it must be prepared immediately before the procedure to remain effective during the scan. Once the substance is injected, patients are advised to rest and avoid significant movement, so that the radioactive material can be properly localized in the tissue. Scanning usually begins after 30-90 minutes.