The Day Before Your Examination

  • Avoid heavy physical activity.
  • You must avoid being cold. Do not use the air conditioning at home or in your car. It is recommended to take a hot bath.


  • It is recommended to have a light meal the meal that precedes your exam. Avoid eating carbohydrates such as pasta, bread, rice, potatoes, chips, fruit or pastries. You must also avoid sugar and its substitutes. Be careful, as various types of food contain sugar (e.g. juice).
  • You may have a light snack in the evening before the test, while avoiding the above-mentioned food and sweet beverages.
  • Since the localization of the radioactive substance (FDG) in your body is directly linked to your blood sugar level, it is important to follow these recommendations. What you eat the day before can greatly affect the quality of the examination.

The Day of Your Examination

  • You must be in a fasting state (from midnight; 6 hours minimum). You are only allowed to drink water (as much as you want).
  • You must avoid eating candy, chewing gum or consuming cough drops or cough syrup.
  • You must avoid smoking.
  • If you are diabetic, you can take your NPH insulin (long lasting action) but not your R type insulin. You can consult your physician or pharmacist in case of doubt. If you take oral hypoglycemic medication, please communicate with us.
  • You can take all of your other usual medication with water.
  • You must avoid being cold (no air conditioning).
  • Avoid heavy physical activity.
  • If you are a woman, you might have to take a pregnancy test (urine sample) to be sure that you are not pregnant.
  • If you are breast-feeding your baby, you will have to avoid doing so for 12 hours after your examination.

What You Must Bring With You on the Day of the Examination

  • A copy of the written reports on your last radiological examinations (CT, MRI, etc.), along with the CD of those examinations, where possible.
  • Your medical information (for example, the surgeries you have had and all the dates of your chemotherapy).
  • A list of your medication.


If you are claustrophobic, you might want to come on site and see whether or not you believe you will be able to go through with the examination. Please communicate with us to plan a pre-examination visit.

You might have to receive an insulin injection on the morning of the examination. In such a case, this procedure will be done under medical supervision.

FDG-F18 is ordered 24 hours in advance specifically for you. If you need to cancel your appointment, please notify us one working day in advance. Otherwise, you will have to assume the cost of the product.


The examination will last approximately 3 hours and will proceed as follows:

  • We will ask you a few questions to collect medical information and we will assess your blood sugar level.
  • You will probably have to drink orange-flavoured barium (liquid contrast medium for the digestive system).
  • You will be given through intravenous injection a glucose-based radioactive isotope: FDG-F18. This substance does not have any side effect. The exposure to rays during a PET/CT examination is comparable to the one created by a diagnostic CT scan.
  • You will then relax on a lounge chair for approximately one hour.
  • The PET/CT imaging will begin and last for less than an hour.
  • You will only have a minimal amount of radioactivity in your body by the time you leave our facility. You will be able to resume your usual activities.

Approximate duration:

  • Three Hours
Nuclear Medicine, PET/CT and CT scans
Nuclear imaging and PET/CT Centre VM-Med
2345 Guy Street
Montreal, QC, H3H 2L9
Tel: (514) 933-2778
Toll Free: 1-800-849-6048
Fax: (514) 933-4646
Opening Hours

Monday – Friday:

8AM – 5PM

Saturday – Sunday: