24/7 Patient Assistance: 760-405-8205

What are the rules about eating or drinking before my PET scan?

You should carefully follow the next steps in preparation for your PET scan:

  • 48 hours prior to your PET scan: avoid overtraining and exercise.
  • 24 hours prior to your PET scan: no sweets, caffeine, alcohol and tobacco; stay on a low carbohydrate diet. DO NOT eat or drink: cereal, pasta, potatoes, rice, bread, milk, ice cream, fruit, liquors, and also diet soda, red wine, black tea, sugar-free chewing gum and mints. EAT meat, butter, hard cheese, eggs, tofu and vegetables with no starch. 
  • 6 hours prior to your PET scan: avoid eating and drinking altogether as it affects the quality of the images. You are encouraged to drink as much water as you can, as it helps with the radiotracer. You may take your prescribed medication with plain water (no insulin).

Depending on your specific medical condition, your doctor might give you other instructions.

We wanted a resource where people who are looking for better help can find it, because one of the issues that I have found is that the diagnosis takes a little bit, some people don’t know if they are diagnosed or not. This is something that it is important enough, that is why I wanted to put the information together.