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A PET-CT scan combines a tracer injection with CT to show how tissues are working. Learn how to prepare, including fasting, how long it takes, and how Medicare applies.
Also called: PET scan, PET/CT, FDG PET, whole body PET scan, PET CT scan
Find a clinic for your PET-CT scan
6 clinics offer bulk billing for PET scan — eligibility varies
Where to get a PET-CT scan
6 clinics across Melbourne and Victoria on Radly offer PET scan.
Clinics for a PET-CT scan on Radly
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What is a PET-CT scan?
A PET-CT scan combines two tests in one. A small amount of tracer — most commonly FDG, a form of glucose — is injected and is taken up by active cells. The PET camera shows where the tracer collects, and the CT shows the anatomy, so the two together pinpoint areas of activity.
PET-CT is most often used to stage and monitor cancer, and also for some heart, brain and infection questions. After the injection you rest quietly for about an hour while the tracer distributes, then lie on the scanner for the pictures. If you're having a PET scan for a cancer question, your specialist will talk you through what the results mean.
Why your doctor might request a PET-CT scan
- Staging some cancers and checking response to treatment
- Looking for the source of an unexplained finding, as directed by a specialist
- Assessing some types of lymphoma
- Some heart, brain or infection assessments
PET-CT scan: preparation, referral & Medicare
Preparing for your PET-CT scan
- Fast for about 6 hours (water is usually fine) — the clinic will give exact instructions
- If you have diabetes, tell the clinic early; you'll get specific instructions about food and medication
- Avoid strenuous exercise for 24 hours beforehand
- Wear warm, comfortable clothing without metal
- Tell staff if you are pregnant or breastfeeding
How long it takes: About 2–3 hours in total, including the rest period after the injection
Referral, Medicare & bulk billing
Medicare covers PET-CT for specific cancer and clinical indications, generally on a specialist referral. Scans outside those indications are private. The clinic will confirm whether your referral is Medicare-eligible. Booking through Radly sends a request, and the clinic confirms the time with you.
How it works
Get your referral
Most scans need a referral from your GP, specialist, or other health practitioner.
Compare clinics
Find clinics near you for your PET-CT scan and compare bulk billing, reviews, and location.
Send your request
Share your preferred timing and send the clinic your details and referral when available.
Clinic confirms
The clinic reviews your request and confirms your appointment and any preparation needed.
If the clinic hasn’t acknowledged your request after 24 hours, Radly will follow up. We check in by SMS during daytime hours where SMS is available and you haven’t opted out. Reply N if you haven’t been contacted and our team will follow up. Acknowledgment does not mean an appointment is booked.
PET-CT scan FAQs
How long does a PET scan take?
Allow 2–3 hours. Most of that is resting after the injection; the scan itself takes about 20–40 minutes.
Can a GP refer me for a PET scan?
Medicare-rebated PET scans generally need a specialist referral for specific indications. The clinic will confirm.
Do I need to fast before a PET scan?
Yes, usually for about 6 hours, as food affects how the tracer is taken up. Water is usually allowed.
Will I be radioactive afterwards?
Only for a short time. The clinic may suggest avoiding close contact with babies and pregnant people for a few hours.
How do I book a PET-CT scan online?
Choose a clinic on Radly, select PET Scan as your scan, add your preferred timing and attach your referral, then send your booking request. The clinic contacts you to confirm the appointment and any preparation.
How soon can I get a PET-CT scan?
Appointments for PET scan are usually within 1–2 weeks, depending on the clinic and the exam. You can send a request on Radly at any time, and the clinic replies with its next available time.
Related scans
Helpful guides
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