Choosing your tracer
Can You Choose — Your PET Scan Tracer?
Patients increasingly arrive having read about PSMA, FAPI or F-DOPA and want to know whether they can request one. The tracer is a clinical decision — but asking about it is not only reasonable, it can sometimes change your team's approach.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- It is a clinical decision — Your oncologist orders the tracer that answers the specific question your cancer raises — not the one you have read about.
- Each tracer does something different — PSMA finds prostate cancer. FAPI shows certain tumour environments. FDG tracks metabolic activity. They are not interchangeable.
- Asking is entirely reasonable — You have the right to understand why a specific tracer was chosen. Your team should be able to explain it in plain language.
- Newer is not always better for you — Accuracy depends on whether the tracer matches what your cancer produces — not on how recently it was developed.
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Your oncologist chooses the tracer, not you. Each tracer answers a specific clinical question: FDG tracks metabolic activity, PSMA shows prostate cancer spread, FAPI and F-DOPA have their own narrow uses. Picking the wrong one for your cancer does not give you more information — it gives you less. You can always ask why a particular tracer was ordered.
CION's PET-CT scans in Hyderabad start at Rs 10,499 — among the lowest published prices in the city, with no hidden charges. Indicative price, as of September 2026.
What does each tracer actually show?
| FDG | PSMA | FAPI | F-DOPA | |
|---|---|---|---|---|
| What it detects | Glucose uptake — high in most actively dividing cancer cells | Prostate-specific membrane antigen on prostate cancer cells | Fibroblast activation protein, elevated in many tumour microenvironments | Dopamine pathway activity, concentrated in neuroendocrine tissue |
| Where evidence is established | Most solid tumours, lung, lymphoma, head and neck, oesophagus | Prostate cancer: initial staging, recurrence detection, response assessment | Emerging across several tumour types — not yet standard of care for most uses | Neuroendocrine tumours; certain brain tumours |
| Where it may give less useful information | Slow-growing or low-grade tumours; brain (normal brain uses glucose heavily) | Any cancer other than prostate — PSMA is prostate-specific | Evidence still maturing for most cancers; may not yet change your management | Most common solid tumours — not the right target for breast, lung, or bowel |
| Indicative cost at CION partner centres (2026) | Standard rate — ask at booking | ₹23,999 (indicative, subject to change) | ₹23,999 (indicative, subject to change) | ₹23,999 (indicative, subject to change) |
Who decides which tracer you get?
Your oncologist orders the tracer, and that order is based on a specific clinical question: what is your cancer type, what stage are you at, and what needs to be confirmed before the next treatment decision.
Each tracer is designed to detect a specific biological target. Ordering PSMA for a patient with lung cancer does not give a more sensitive scan — it gives an uninformative one, because PSMA does not bind to lung cancer cells.
You have the right to understand the reasoning. Asking 'why this tracer and not PSMA or FAPI?' is a completely reasonable question, and your team should be able to answer it in plain language.
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
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What if you want PSMA or another tracer instead?
Asking is sensible, not a problem. PSMA, FAPI and F-DOPA each do something FDG cannot, and in the right situation they genuinely change how a cancer is managed.
If your oncologist is not ordering one of them, there is usually a clear reason: it may not be indicated for your cancer type, the evidence may still be emerging for your specific situation, or FDG may answer the clinical question more precisely.
Tell your team where you read about it and what interested you. That conversation is more useful than arriving with a request — and it sometimes reveals that the alternative you read about is in fact appropriate for you.
Did you know?
PSMA PET-CT was shown in clinical trials to detect prostate cancer spread more accurately than conventional CT and bone scans combined. That improvement is real — but it is specific to prostate cancer, because the tracer binds to a protein that prostate cancer cells produce in large amounts.
In a patient with any other cancer type, a PSMA scan produces almost no signal. This is why tracer choice is a clinical match, not a preference.
Source: EANM/SNMMI procedural guidelines for PSMA PET imaging; NCCN Prostate Cancer Guidelines
CION does PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city — including an oncologist-reviewed report and a free Rs 950 consultation. Indicative price, as of September 2026.
Explore 72 more Specialised Tracers and How PET-CT Compares topics
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- When Is a DOTA PET Scan Ordered?
- Why Do I Need Both a DOTA PET and an FDG PET?
PET-CT vs Other Scans
- Can an MRI Replace a PET-CT to Avoid Radiation?
- Choosing Between Scans: A Decision Guide by Question
- Combining PET-CT With MRI in the Same Week
- Diagnostic CT vs the CT Inside a PET-CT
- Do You Need Both a CT and a PET-CT?
- Follow-Up Scanning: Alternating PET With Other Tests
- PET-CT vs Biopsy: Which Actually Diagnoses Cancer?
- PET-CT vs Bone Scan for Bone Metastases
- PET-CT vs CT Scan: What Is the Difference?
- PET-CT vs MRI: Which Do You Need?
- PET-CT vs PET-MRI: Is the Newer Machine Better?
- PET-CT vs Tumour Markers for Follow-Up
- PET-CT vs Ultrasound and Mammography
- PET-CT vs Whole-Body MRI for Screening
- When Is a PET-CT Not the Right Test?
- Why Your Doctor Ordered PET-CT and Not a Cheaper Scan
PSMA PET-CT
- False Positives on PSMA PET
- Is PSMA PET Available in Hyderabad and How Soon?
- Is PSMA PET Covered by Insurance or Aarogyasri?
- PSMA PET Before Prostate Surgery or Radiation
- PSMA PET and Lu-177 PSMA Therapy: The Link
- PSMA PET for Cancers Other Than Prostate
- PSMA PET vs Bone Scan and MRI for Prostate Cancer
- PSMA PET vs Normal FDG PET for Prostate Cancer
- PSMA PET-CT Scan Cost in Hyderabad
- PSMA PET-CT: What It Is and Who Needs It
- PSMA-Avid Lesions: What the Report Means
- Preparing for a PSMA PET-CT Scan
- Reading a PSMA PET Report: PRIMARY and miTNM
- Repeat PSMA Scans: How Often and Why
- Rising PSA With a Negative PSMA Scan: What Now?
- When Should You Get a PSMA PET Scan?
Timing Around Treatment
- Baseline PET-CT Before Starting Treatment: Why It Matters
- Can a PET-CT Be Done During Active Chemotherapy?
- Emergency and Urgent PET-CT: When It Cannot Wait
- How Soon After a Previous PET Can You Have Another?
- Interim vs End-of-Treatment Scanning
- PET-CT After Growth Factor Injections
- PET-CT After Steroids: Does It Affect the Scan?
- PET-CT After a Biopsy: How Long to Wait
- PET-CT Before Surgery: What Surgeons Want to Know
- Scanning Too Early: Why It Wastes Money and Causes Panic
- When Should You Have a PET-CT After Chemotherapy?
- When Should You Have a PET-CT After Immunotherapy?
- When Should You Have a PET-CT After Radiotherapy?
- When Should You Have a PET-CT After Surgery?
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Common questions
Frequently asked questions
Can I just pay extra to get PSMA or FAPI instead of FDG?
Paying for a specialised tracer when it is not clinically indicated does not give you more information — it gives you less. PSMA produces almost no signal in cancers other than prostate. FAPI's clinical value is still being established for most tumour types. Your oncologist's choice is about matching the tracer to your cancer, not about access or cost. Specialised tracers are available at CION partner centres at ₹23,999 (indicative, 2026), and when they are right for you, your team will order them.
What if I think my oncologist has chosen the wrong tracer?
Ask directly. Say: 'I read about PSMA or FAPI — can you explain why that was not ordered for me?' That is a reasonable clinical question and your team should answer it clearly. If you are not satisfied with the explanation, a second opinion from another oncologist is the right step — not simply arranging a different scan at a different centre. A radiologist at an imaging centre cannot advise you on which tracer is clinically appropriate; that judgement belongs to your treating oncologist.
Is FAPI available in India and is it approved?
FAPI is available at a small number of specialist nuclear medicine centres in India, including through CION's partner imaging network. Its use in India is still evolving — it is not part of standard-of-care guidelines for most cancers in the way that FDG and PSMA are. CDSCO approval status and clinical guidelines for FAPI continue to develop. Your oncologist will tell you whether the current evidence supports it for your specific cancer type.
Are newer tracers always more accurate than FDG?
No. Accuracy depends on whether the tracer matches your cancer's biology. PSMA is highly accurate for prostate cancer and almost useless in others. FAPI shows uptake across many tumour types, but whether that uptake changes your management is still being studied for most of them. F-DOPA is well-established for neuroendocrine tumours and not relevant for most solid tumours. Newer means more specific to a different biological target — not universally more sensitive.
What does FDG miss that newer tracers can find?
FDG images glucose metabolism, which is elevated in many but not all cancers. It tends to miss slow-growing or low-grade tumours, and normal brain tissue uses glucose heavily, which makes brain tumour assessment harder. PSMA detects prostate cancer spread that FDG and conventional imaging miss. FAPI may show uptake in tumours with low metabolic activity on FDG. F-DOPA images the dopamine pathway, which is active in neuroendocrine tissue even when FDG uptake is low. The right tracer is the one matched to your specific clinical question.
How do I raise a specific tracer I have read about at my next appointment?
Say exactly where you read about it — a news article, a family member's experience, an online patient group — and what specifically caught your attention. Your oncologist can then explain whether that tracer applies to your cancer type, whether the evidence is mature enough to change your management, and whether it is available. The most useful question is not 'can I get PSMA?' but 'is there a tracer that would give you more information about my cancer than the one you have ordered?'