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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.
You can put it in quickly, and itâs usually not painful. It measures the amount of glucose in the fluid inside your body. A transmitter on the sensor then sends the information to a wireless-pager-like monitor that you can clip on your belt. The monitor displays your sugar levels at 1-, 5- and 10-minute intervals.If your sugar drops to a dangerously low level or a high preset level, the monitor will sound an alarm. In the past, only doctors could see the readings CGM systems collected. Now anyone can use the devices as part of at-home diabetes care.he monitor displays your sugar levels at 1-, 5- and 10-minute intervals. If your sugar drops to a dangerously low level or a high preset level, the monitor will sound an alarm. In the past, only doctors could see the readings CGM systems collected. Now anyone can use the devices as part of at-home diabetes care.