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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.
If you will not be able to make your PET/CT scan appointment or if you have any questions about your. exam, please notify our Scheduling Department at least 24 hours before your exam at (512)458-9098. Please see more diet instructions on the back of this page. Pet/ct scan PreParatIon InstructIons. The day before your PET/CT scan there are certain instructions to follow. 1. During the day, avoid overindulging in sugars or carbohydrates as much as reasonably possible. 2. Avoid strenuous activity. This means no heavy lifting (such as weight lifting), aerobic activity or yard work.