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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.
Maintaining a proper blood glucose level can be tricky business, as even a healthy cat's glucose level changes throughout the day. If the vet detects a higher than normal blood glucose level in your cat, she'll require a few more tests to determine the cause. If she has diabetes, you and your vet will have to work together to ensure her glucose level remains in a normal range throughout the day.