Why Asking Questions Matters
A PET CT scan is an important step in your medical care, and understanding why it has been ordered and what to expect helps reduce anxiety and ensures you are properly prepared. You do not need to become an expert in nuclear medicine, but a few well-chosen questions can make the experience smoother.
Questions About the Scan Itself
Which tracer will be used? Different tracers are used for different purposes. FDG is the most common, but your doctor may have ordered a PSMA, FAPI, or another specialised scan. Knowing which tracer is being used helps you understand what the scan is looking for and what preparation you need.
Why is this scan being done now? Understanding the purpose, whether it is for staging, monitoring treatment response, checking for recurrence, or evaluating a suspicious finding, helps you know what your doctor hopes to learn from the results.
Are there specific preparation instructions? Most PET CT scans require fasting, but the duration and other requirements can vary depending on the tracer. Confirm the preparation steps with your doctor or the scanning centre so there are no surprises on the day.
How long will the appointment take? A PET CT visit typically takes 2 to 3 hours including preparation, the waiting period after tracer injection, and the scan itself. Knowing this helps you plan your day.
Questions About Results and Next Steps
When will the results be available? Report turnaround varies between centres. Knowing when to expect results helps manage the waiting period and plan your follow-up appointment.
Who will explain the results to me? The report goes to your referring doctor, who will discuss the findings with you. Confirm who will be reviewing the results and how you will receive them.
How will the results affect my treatment plan? Understanding how the scan fits into the bigger picture of your care helps you see it as a tool rather than just another test. Your doctor can explain what different outcomes might mean for your next steps.
Questions About Safety
How much radiation is involved? If you have concerns about radiation exposure, your doctor or the nuclear medicine team can explain the dose and how it compares to other common exposures. The dose from a PET CT is carefully controlled and justified by the clinical need.
I have diabetes. Does that affect the scan? Yes, it can. Blood sugar levels affect FDG uptake, so patients with diabetes need specific instructions about medication and fasting. Make sure this is discussed before the scan is booked.
I am pregnant or breastfeeding. What should I do? Inform your doctor immediately. PET CT scans involve radiation and are generally avoided during pregnancy unless absolutely necessary. Special guidance applies for breastfeeding mothers.
Before You Leave the Appointment
Make sure you have the scanning centre’s contact details and clear written preparation instructions. If anything is unclear, ask. The medical team expects these questions and would rather answer them in advance than deal with preparation issues on the day of the scan.
Explore the different types of PET CT scans to learn more, or get in touch with the nuclear medicine team for specific queries.