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Frequently Asked Questions About PET/CT Scans

What is the process like and how long does it take?

  • An IV line is started, usually through a vein in one of the arms. A small, safe amount of radioactive FDG is injected. You should not feel any side effects. 
  • After the injection, you will need to wait approximately one hour before the start of the scan while the material is distributed throughout the body. 
  • Scan time can vary from 30 minutes to 45 minutes.

How do I prepare for the exam?

  • You are not allowed to eat for about six hours prior to your appointment.
  • Also, refrain from exercising for 24 hours prior to your test.


  • We will ask what medications you take so you may want to prepare a list of medications ahead of time to bring with you.
  • You will be provided further instructions before your test if you are diabetic.

What happens after the scan?

  • You should feel fine. There are no side effects. 
  • Drink fluids to ensure urinating and clearance of the radioactive FDG . 
  • You can drive and resume normal activities immediately after the scan.

When will I get results?

  • Your physician will receive a copy of your results within 24 hours.