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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.
But dogs that have blood glucose levels persistently greater than 200mg/dL have diabetes. With the medicines of today, there is no way you can duplicate the normal situation with injected insulin. The best you can hope for is to keep your pet's blood sugar level between 100mg/dL and 150mg/dL. Occasional owners can attain that, but most will find that their dogs peak (spike) considerably higher. Larger or more frequent doses of insulin will drive down these glucose spikes.