Diabetic Preparation Guide For FDG PET/CT Patients

(Not applicable for PSMA or Dotatate PET Patients)

FDG PET/CT exams use a baseline of sugar (called glucose) to establish normal cell activity range. To optimize your FDG PET/CT imaging exam, NCPIC created this 7-day diet preparation to help you achieve appropriate glucose levels. 200 mg/dL or less is glucose goal. Following this guide will avoid unnecessary glucose uptake.

7 Days Prior to your Exam

Practice Run
• Please conduct a glucose test practice run. Your morning blood glucose level should fall between 70-200 mg/dL.

200 mg/dL or less is glucose goal
• If you struggle to regulate your blood glucose, consult your diabetes doctor before the scan.
• If your glucose levels exceed 200 mg/dL, please call NCPIC at 916.737.3211 to discuss.

No Insulin day-of exam
• You will not be able to inject insulin on the morning of the scan. (Exceptions may apply if you are on an insulin pump).
• Seek assistance from your diabetes doctor in regulating your blood sugar levels should you have any issues.

Recommended Foods

Not Recommended Foods

Eggs: Hard-boiled, scrambled, or omelets.
Poultry: Grilled chicken breast or turkey breast. (no breaded or foods)
Fish: Grilled Salmon, tuna, cod, halibut.
Lean meats: Grilled or baked Beef, pork tenderloin, veal.
Seafood: Shrimp, crab, lobster.
Dairy: Greek yogurt, cottage cheese, cheese (cheddar, mozzarella, Swiss).
Tofu: Firm tofu can be a good source of protein.
Nuts and seeds: Almonds, walnuts, pumpkin seeds, chia seeds.
Nut butter: Peanut butter, almond butter (check for added sugars).
The above list is called high protein, no carbohydrate diet.

Grains: Rice, sticky rice, bread, pasta, oats, quinoa, barley.
Cereals: Breakfast cereals, granola.
Starchy Vegetables: Potatoes, corn, peas, pumpkin, butternut squash.
Legumes: Beans (black beans, kidney beans, chickpeas), lentils.
Fruits: Bananas, apples, oranges, grapes, berries, mangoes.
Dairy: Milk, yogurt (regular, flavored), ice cream.
Sweets and Desserts: Cookies, cakes, pastries, candy, chocolate, sugary beverages.
Sugars and Sweeteners: White sugar, brown sugar, honey, maple syrup, agave nectar.
Processed Foods: Snack foods (chips, crackers), packaged snacks, sugary cereals.
The above list is called a high carbohydrate diet.

2 Days Prior to your Exam

• Follow a high protein/low-carbohydrate diet listed on the recommended foods list.

1 Day Prior to your exam

Take your usual insulin dose with meals, and avoid strenuous exercise or physical activity.
• Continue the allowed list of foods (high-protein/low-carbohydrate diet).
• A gentle walk the night before your exam may help lower your sugar levels.

The Evening Before Your Exam

Insulin Patients
• Insulin Pump patients: If your appointment was scheduled after 8:00 am, please call us at 916 737 3211.
• If you take a bedtime dose of insulin, follow the prescribed order and have a high protein snack right before bedtime.
• Long-acting insulin patients: If you normally inject long-acting insulin in the morning, you may need to take it the evening before your scan.

All Patients
• Eat a light high protein/no carbohydrate meal.
• Drink only plain, unflavored water until after your PET/CT scan is complete.
• Avoid strenuous exercise or physical activity.
• A gentle walk the night before your exam may help lower your sugar levels.

Day of Your scan (glucose goal 70-200mg/dl)

Insulin Patients
• Do NOT inject insulin the day of your scan.
• Please keep your insulin pump in “nighttime setting” until the PET/CT study is complete.

Morning Scheduled FDG PET/CT patients
• 6-hour fast from all foods – no gum, mints, candy, etc.
• Drink plain, unflavored water only, until after your PET/CT scan is complete.

Afternoon Scheduled FDG PET/CT patients
• Eat a light high protein/no carbohydrate breakfast no more than 6-hours before your PET/CT exam.
• After this meal, fast from all foods– no gum, mints, candy, etc.
• Drink plain, unflavored water only, until after your PET/CT scan is complete.

All Patients
• Do Take non-diabetic medications as prescribed, with non-flavored water only.
• Check your blood glucose level before the exam, if it is below 70 mg/dL or above 200 mg/dL on the morning of your scan, please call for instructions.
• If you experience symptoms of hypoglycemia, treat low blood glucose as needed and call us at 916 737 3211 to reschedule your exam.
• Avoid excessively low blood sugar levels.

Post Scan

All patients will be given a goodie bag with snacks after your exam.