Description
Why It’s Done
A Whole Body PET Scan Without Contrast is typically used when:
• A patient cannot receive contrast dye due to allergies or kidney problems
• A general metabolic overview of the body is sufficient
• There is a need to detect or monitor cancers or other conditions without detailed contrast imaging
Common clinical uses include:
• Cancer detection, staging, or monitoring (e.g., lymphoma, lung cancer, colorectal cancer, etc.)
• Evaluating treatment response
• Detecting metastasis or recurrence
• Assessing unexplained symptoms like fever of unknown origin or weight loss
• Monitoring inflammatory or infectious diseases
While the lack of contrast limits some anatomical detail, the scan still provides highly valuable functional information.
Preparation
To ensure high-quality results, please follow these preparation guidelines:
1. Fasting:
• Do not eat or drink anything (except water) for 4–6 hours before the scan.
• Avoid high-sugar or high-carbohydrate foods the day before the test.
2. Hydration:
• Drink plenty of water before the scan (unless otherwise instructed). Staying well-hydrated helps with tracer distribution and elimination.
3. Blood Sugar Control:
• Blood glucose should ideally be below 150 mg/dL at the time of the scan.
• If you have diabetes, consult your physician for instructions on adjusting insulin or medication on the day of the scan.
4. Medications:
• Continue taking regular medications unless advised otherwise.
• Bring a list of all current medications.
5. Avoid Physical and Mental Stimulation:
• Avoid strenuous physical activity for 24 hours before the scan.
• Rest quietly in a low-stimulation environment after the tracer is injected (you may be asked to wait 30–60 minutes before imaging).
6. Avoid Substances:
• Do not consume caffeine, alcohol, nicotine, or recreational drugs for at least 12 hours prior to the test.
7. Clothing:
• Wear comfortable, loose-fitting clothes without metal (zippers, snaps, underwire, jewelry).
• You may need to change into a hospital gown.
8. Inform Your Doctor If:
• You are pregnant, planning pregnancy, or breastfeeding
• You have diabetes, thyroid issues, or recent infections or surgeries
