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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.
1 When your cat's blood glucose levels are above 180 mg/dl, glucose will spill over into the urine. 2  The amount of sugar in the urine is not a measure of the blood glucose at that moment, but rather an average of the blood glucose over the several hours during which the urine was being produced. If you test blood glucose at any time and the glucose level is 50 or lower, do not give insulin! Give your cat approximately one tablespoon of Karo syrup or honey and retest blood glucose levels in one hour. Repeat the oral sugar dosing if the blood glucose level is still 50 or lower.