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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.
A complete blood count as well as a blood chemistry profile will help the vet to determine if there are other potential illnesses present that could cause an elevated glucose level. An urinalysis also is helpful because when a cat's glucose level is higher than 240 mg/dL, sugar is present in the urine.