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Foods to Eat Before a PET Scan. A PET (positron emission tomography) scan is a powerful process for detecting cancer. Cancer cells grow extremely fast and need a lot of glucose. A doctor will inject the patient with glucose, and the PET scanner detects if any cells are emitting signs of high glucose use. If you eat before your PET scan, you risk throwing your glucose levels off balance and getting inaccurate results.
The last pet I had I was instructed not to eat for 6 hours prior to the scan. When I arrived they tested my blood sugar to make sure it was in normal range. The medicine they give you to drink prior to the scan is some type of glucose concoction. Since cancer tumors intake all the sugar they can, thats what makes the pet show the activity of any cancer tumors as they suck up the glucose and as they say light up the cancer tumors. Lori.