What should I expect during a PET scan for Prostate Cancer

What to Expect During a PET Scan for Prostate Cancer

A PET scan (positron emission tomography) is an imaging test that helps doctors see how active cancer cells are in your body. Here's what you should know about the process:

Before Your Scan

Preparation:

• You'll typically fast (not eat) for 4-6 hours before the scan
• Avoid strenuous exercise for 24 hours beforehand (this can affect results)
• Wear comfortable, loose clothing with no metal (zippers, buttons, or jewelry can interfere)
• Arrive 15-30 minutes early for check-in

What happens:

• You'll receive an IV (intravenous line) in your arm
• A radioactive tracer (usually a glucose-based compound) is injected through the IV
• You'll wait 30-60 minutes in a quiet area while the tracer circulates through your body—cancer cells typically absorb more of this tracer than normal cells

During the Scan

The experience:

• You'll lie on a table that slides into a large, donut-shaped machine
• The scan is painless and usually takes 20-40 minutes
• You need to stay still during imaging
• The machine makes clicking and whirring sounds (some facilities provide headphones)
• You can communicate with the technologist through an intercom if needed

After Your Scan

• The radioactive tracer leaves your body naturally over several hours
• You can return to normal activities immediately
• Drink extra fluids to help flush the tracer from your system
• Results typically take 1-2 business days; your doctor will review them with you

Why PET Scans Matter for Prostate Cancer

According to NCCN (National Comprehensive Cancer Network) Guidelines for Prostate Cancer, PET imaging with specific tracers (like PSMA or choline-based tracers) is increasingly used to:

• Detect if cancer has spread beyond the prostate
• Identify lymph node involvement
• Find distant metastases (cancer spread to bones or other organs)
• Help guide treatment planning

The American Cancer Society notes that newer PET tracers specifically designed for prostate cancer detection are becoming more widely available and can provide more precise information than traditional imaging.

Questions to Ask Your Care Team

1. Which type of PET tracer will be used? (PSMA, choline, or another type—this affects what the scan can detect)
2. Why is this scan being done now? (staging, monitoring treatment response, or evaluating recurrence?)
3. How will these results affect my treatment plan?
4. When will I get the results, and how will we discuss them?
5. Are there any restrictions I should follow before or after the scan?

Important Notes

• PET scans use very small amounts of radiation—the benefit of the information typically outweighs this minimal risk
• If you're claustrophobic, let your medical team know; they can discuss options
• Bring a list of all medications and supplements, as some may need to be paused

This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.