PET cardiac sarcoidosis scan

What is this test?

It is a scan done to find and evaluate granulomas in the heart. A granuloma is a small area of inflammation in tissue.

Your Appointment

If you make any changes to your insurance before your appointment please call Registration at 1-866-309-0832. This will help lessen delays and the need to reschedule your test, as many radiology services need pre-authorization.

Take Elevator I to the Lower Level. PET Imaging Center is across the hall from the elevator.

If you cannot do the prep listed below, you may not be able to have the test, or it may need to be rescheduled.

Call the PET Center at 1-319-356-4100 and ask to talk with a nurse if you cannot keep your appointment or have questions.

Getting ready for your test

  • You will have your blood sugar checked when you get to the PET Center. If your blood sugar is above 200, the test will be rescheduled.
  • Do not wear jewelry.
  • Do not wear clothing with metal.

Before your test, tell your doctor or nurse if:

  • You are pregnant, think you may be pregnant, or you are breastfeeding.
  • You have diabetes. Your diabetes medicine may need to be changed before the test.
  • You have a fear of closed-in places or if you are very nervous.


The day before your test, eat only:

  • Plain* meat without breading, such as beef, pork, chicken, or fish
  • Plain* eggs and nuts
  • Water, black coffee, or tea without sweetener, milk or creamer.
  • Do not eat processed foods.

*Plain means no sauces, dressings, or breading. Salt, pepper, and butter are okay.

Do not eat for 12 hours before the test. You may drink water, black coffee, or tea with no limit.

If you have any other test today where you are told not to eat or drink for a longer amount of time, follow those instructions. 


  • Take your normal medicines with water before your test.
  • Talk to a nurse in the PET Center if you take medicine for your diabetes.

What to expect

You may be at the PET Center for two to three hours.

  • You will have a blood perfusion scan before your test.
  • During the test, we will put a small amount of radioactive tracer into your vein through an intravenous (IV) catheter.
  • You will wait 60 minutes in a room before being scanned by the camera. The test will take 20 to 25 minutes.

After the test you may:

  • Eat your normal diet
  • Do your normal activity
Last reviewed: 
September 2018

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