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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.
Preparing Your Pet for a Blood Test. Having your pet properly prepared before blood collection helps to ensure that test results are as accurate and reliable as they can be. Sometimes abnormal test results say more about how the pet was prepared than about true illness.