PET Scanning

What is a PET Scan?

Positron Emission Tomography, or PET scanning, is one of the most advanced imaging tests available today. The test combines PET and CT (computerized tomography) images, to produce a traditional three-dimensional x-ray of the internal body structures allowing better evaluation and visualization of your body.

The PET scanner detects which cells in your body are using a large amount of sugar and then interprets this information to show areas of increased metabolic activity. Since cancers are overactive cells, the PET scanner is an excellent tool for determining if a suspicious area is cancerous or benign. It can also identify if cancer has spread to other locations, something not always possible with traditional x-rays.

What to Expect

When you arrive, an intravenous (IV) line will be started. You will receive an injection of a small amount of radioactive glucose (sugar) that has been prepared in advance for the specific time of your appointment. You will then rest quietly for one to two hours as your body starts to absorb the sugar. When you are ready for your scan you will lie on a table that will move slowly through a doughnut-shaped machine similar to a CT scanner. The scan itself is painless and will take between 15 and 30 minutes.


24 hours prior to your appointment:

  • Discontinue or avoid strenuous exercise, sugar, tobacco products, and caffeine
  • Drink 48 ounces of water 24 hours before your appointment
  • On the day of your appointment, drink 24 to 48 ounces of water


  • Patients should have a low carbohydrate (no bread, pasta, rice, cereal, potatoes), high protein meal (meat, chicken) the day before exam. No sugar.
  • For an appointment time between 7 a.m. and noon, do not eat or drink anything for 6 hours before your appointment, except plain/clear water.
  • For an appointment time between 1 and 4 p.m., do not eat anything 4 hours before your appointment, except plain/clear water. Patients may have a light, low carbohydrate breakfast with NO sugar or coffee.
  • Most medications can be taken with water with the exception of insulin. Patient who require insulin, must only take half dose 4 hours before appointment.


The total time you will spend at the hospital will be approximately 3 to 4 hours

After Your Scan

  • You can leave immediately, and can resume normal activities
  • You can resume your normal diet. Drink 24 to 48 ounces of water over the next 24-hour period
  • The injection you receive loses its radioactivity very quickly, but as a precaution avoid being in close contact with children under 16 years of age or pregnant women for 12 hours following your PET scan
  • It is recommended that breastfeeding be discontinued for 24 hours after this procedure and that someone else feeds the infant


  • If you have diabetes, discuss this with your physician and call PET scheduling at (989) 633-5252 or (888) 367-2778, in Alpena call (989) 356-8001, two days before your exam for further instructions.
  • If you think you may be pregnant, or if you are breastfeeding, please call PET scheduling at (989) 633-5252 or (888) 367-2778, in Alpena call (989) 356-8001, least 24 hours prior to your appointment.

Related Locations

  • PET Scanning
    PET Scanning

    (989) 343-3145

    2463 S. M-30
    West Branch, MI 48661

  • PET Scanning
    PET Scanning

    (989) 633-5252

    300 E. Warwick Drive
    Alma, MI 48801

  • PET Scanning
    PET Scanning

    (989) 633-5252

    4100 Campus Ridge Drive
    Midland, MI 48640