Understanding your scans
Why Has My Doctor Ordered — a PET-CT Scan?
A PET-CT is not always ordered because cancer is being suspected for the first time. Your doctor has a specific question they need this scan to answer — and knowing what that question is makes the wait much less frightening.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- Four reasons, one scan — PET-CT is ordered to stage cancer, check treatment response, look for recurrence, or investigate an unclear finding.
- Not always first suspicion — Many people getting a PET-CT already have a diagnosis. The scan answers a different question about their existing situation.
- Activity, not just shape — PET-CT shows whether tissue is metabolically active, not just whether something looks unusual on a standard CT.
- The result guides the next step — Your treatment plan, or the decision to continue it, is directly informed by what the scan shows.
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Your doctor has ordered a PET-CT to answer one of four questions: to stage a cancer, check whether treatment is working, look for a recurrence, or investigate a finding that was unclear on another scan. It does not always mean cancer is being suspected for the first time.
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad, with no hidden charges. Indicative price, as of September 2026.
How is a PET-CT different from a regular CT scan?
| Feature | CT scan | PET-CT |
|---|---|---|
| What it shows | Size and shape of organs and tissue | Size and shape, plus how metabolically active the tissue is |
| How it works | X-rays from multiple angles | X-rays combined with a glucose tracer that active cells absorb |
| Preparation needed | Usually none | Fasting for several hours; blood sugar is checked before scanning |
| Time involved | Around 10 to 20 minutes | 60 to 90 minutes, including waiting after the tracer injection |
| Particularly useful for | Detecting a mass or structural change | Distinguishing active disease from scar tissue or old changes |
What do the words on my PET-CT report mean?
- PET
- Positron emission tomography — the part of the scan that uses a small radioactive glucose tracer to show which areas of the body are metabolically active. Most cancer cells absorb glucose faster than normal cells, which makes them visible.
- CT
- Computed tomography — X-rays taken from multiple angles and combined to produce a cross-section image showing the size and shape of organs and tissue. The CT part of a PET-CT provides the anatomical map that the PET images are laid over.
- FDG
- Fluorodeoxyglucose — the glucose tracer injected before the scan. It behaves like sugar in the body. Areas that absorb it quickly, including most cancers and some areas of inflammation, show up brighter on the scan.
- SUV
- Standardised uptake value — a number on your report measuring how actively an area is absorbing the tracer. A higher number means more activity. Your doctor interprets this number alongside your full clinical picture, not in isolation.
- Staging
- The process of establishing how far a cancer has spread — to nearby lymph nodes, other organs, or distant sites. Staging is one of the most common reasons a PET-CT is ordered, and the result directly shapes the treatment plan.
- Hot spot
- An informal term for an area that absorbs more tracer than the surrounding tissue. A hot spot does not automatically mean cancer — inflammation and infection can look similar. Your doctor will explain what any hot spot means in your specific case.
What do I need to do before my PET-CT scan?
- Fast for the number of hours your team specifies, usually four to six hours. Water is generally permitted.
- Tell the scanning team if you have diabetes. The protocol differs for people on insulin or oral glucose-lowering medication, and your blood sugar will be checked before the tracer is given.
- Avoid strenuous exercise for 24 hours before the scan. Muscle activity absorbs the tracer and can affect how the images are interpreted.
- Tell the team about all medicines, vitamins and supplements you are taking, including herbal and traditional remedies.
- Wear loose, comfortable clothing with no metal fastenings. You may be asked to change into a gown.
- Arrange someone to accompany you. You will be mildly radioactive for a few hours after the scan and should avoid prolonged close contact with pregnant women and young children on the day.
- Bring any previous scan images or reports your team has asked you to bring.
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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Does being sent for a PET-CT mean the situation is serious?
Not necessarily. The reason for the scan matters more than the scan itself. Many people having a PET-CT are already in treatment and their doctor needs to know whether it is working. The scan answers that question — it does not change the situation, it describes it.
A PET-CT ordered to investigate an unclear finding on an earlier scan is a way of getting more information before making a decision. It is a question, not a verdict.
Ask your doctor, before the scan, which of the four reasons applies to you. That single answer will make the wait for results easier to manage.
Did you know?
Most cancer cells consume glucose at a faster rate than normal cells — a property that makes them visible on a PET scan even before a tumour is large enough to feel.
The glucose tracer is absorbed preferentially by the most metabolically active tissue in the body, which is why areas of active cancer, and sometimes inflammation, appear brighter on the scan.
Source: IAEA Human Health Series No. 3, Nuclear Medicine Physics: A Handbook for Teachers and Students
What do people most often ask before their PET-CT?
Will it hurt?
The scan itself is painless. You will have a small injection to deliver the tracer, which feels like any routine intravenous injection. After that, you lie still in a quiet room for around 45 to 60 minutes while the tracer distributes through your body, then you move into the scanner. The scanner is a large ring — it does not touch you and there is no sensation during scanning. If you have back pain or find lying still difficult, tell the team before the scan so they can position you as comfortably as possible.
How soon will I get my results?
The images are reported by a nuclear medicine physician or radiologist, and the written report is then reviewed by your oncologist, who interprets it in the context of your full clinical picture. At CION, your doctor will discuss the result with you at your next consultation. Ask them before the scan when to expect that appointment, so you have a date rather than an open-ended wait. If your team has requested an urgent scan, the timeline may be shorter — ask them to confirm.
Is the radioactive tracer safe?
Yes. The tracer used in most PET-CT scans, FDG, uses a radioactive isotope whose activity reduces to a very low level within a few hours. The dose is small and comparable in order of magnitude to other standard diagnostic scans routinely used in cancer care. You will be given specific instructions about what to avoid on the day — typically prolonged close contact with young children and pregnant women — and you can return to normal activities the following day.
Can a family member come into the scan room with me?
Most scanning centres ask family members to wait outside the scan room, partly for radiation safety reasons and partly because the room needs to be quiet while the tracer is distributing. Bring someone with you so you have support before and after, but expect to go into the scan room alone. The team will explain each step of the process before you begin, and you can ask any questions you have at that point.
What if the scan finds something the doctor was not looking for?
PET-CT occasionally shows an area of increased activity that was not the original focus of the scan — sometimes called an incidental finding — because it covers a large area of the body. Your oncologist will review anything unexpected and tell you whether it needs further investigation or whether it can be safely observed. Not every incidental finding leads to action; many are caused by inflammation, infection, or normal variation. If something does need follow-up, your team will explain what it means and what happens next.
I need to fast but I am on regular medication. What should I do?
Tell your oncology team and the scanning centre before the scan day — not on the morning itself. For most medications, taking them with a small amount of water during the fasting period is safe, but this depends on the specific medicine. Diabetes medication requires a specific protocol because the tracer behaves like glucose, and your blood sugar level directly affects how the scan is interpreted. Never skip essential medication without guidance from your team. The right answer is to ask in advance, not to guess on the day.
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 88 more Understanding PET-CT, Cost, Booking & Records topics
Understanding PET-CT & When It Is Needed
- Can a PET-CT Scan Be Normal and Cancer Still Be Present?
- Can a PET-CT Scan Detect Cancer Anywhere in the Body?
- Do You Need a Biopsy If the PET-CT Is Positive?
- Do You Need a Doctor's Referral for a PET-CT Scan?
- Does a PET-CT Scan Mean I Have Cancer?
- How Accurate Is a PET-CT Scan?
- How Long Does It Take to Get a PET-CT Appointment?
- Is a PET-CT Scan Useful for Cancer Screening in a Healthy Person?
- PET-CT Scan Terminology: A Plain-English Glossary
- PET-CT When the Primary Cancer Cannot Be Found
- PET-CT for Staging: Working Out How Far Cancer Has Spread
- PET-CT to Check Whether Treatment Is Working
- PET-CT to Look for Cancer Coming Back
- Questions to Ask Before Booking a PET-CT Scan
- What Can a PET-CT Scan Detect — and What It Cannot
- What Is a PET-CT Scan and How Does It Work?
- What Is a Radiotracer and Which One Will I Be Given?
- Who Should Not Have a PET-CT Scan?
- Whole-Body PET-CT vs a Limited or Regional Scan
- Why Has My Doctor Ordered a PET-CT Scan?
Booking, Access & District Logistics
- Booking Without a Doctor's Referral
- Booking a PET-CT for Someone Living Abroad
- Can You Get a PET-CT Scan Closer to Home?
- Getting an Urgent PET-CT Scan
- How Early Should You Arrive for Your Scan?
- How to Book a PET-CT Scan in Hyderabad
- PET-CT for Patients From Nalgonda and Suryapet
- PET-CT for Patients From North Andhra
- PET-CT for Patients Travelling From Karimnagar
- PET-CT for Patients Travelling From Khammam
- PET-CT for Patients Travelling From Nizamabad
- PET-CT for Patients Travelling From Warangal
- Rescheduling or Cancelling a PET-CT Scan
- What Happens If You Miss Your PET-CT Slot?
- Where to Stay Near a PET-CT Centre in Hyderabad
- Why PET-CT Slots Are Fixed and Cannot Be Moved
Choosing a PET-CT Centre & Quality
- AERB Approval and Radiation Safety Licensing
- Comparing Two Quotes: What Is Actually Different?
- Digital PET and Time-of-Flight: What They Actually Change
- Do You Need to Go to the Same Centre for Follow-Up Scans?
- Does an Oncologist-Reviewed Report Actually Help?
- Does the PET-CT Scanner Model Matter?
- Getting a PET-CT at a Government Hospital in Telangana
- How to Choose a PET-CT Centre in Hyderabad
- Questions to Ask a PET-CT Centre Before Booking
- Red Flags When Choosing a Scan Centre
- Same-Day and Walk-In PET-CT Appointments
- Standalone Diagnostic Lab vs a Cancer Centre
- The Four PET-CT Centres in Hyderabad: Which Is Nearest?
- What Makes a PET-CT Report Good?
- What to Do If You Are Unhappy With Your Scan or Report
- Who Reads Your Scan Matters More Than the Machine
PET-CT Cost, Insurance & Schemes
- Ayushman Bharat, CGHS and EHS Coverage for PET-CT
- Cashless vs Reimbursement for a PET-CT Scan
- Comparing PET-CT Quotes: A Checklist Before You Pay
- Does a Cheaper PET-CT Mean a Worse Scan?
- EMI and Payment Options for a PET-CT Scan
- Free and Subsidised PET-CT: Government Options and Waiting Times
- Hidden Charges in PET-CT Scans: What to Check Before You Book
- Is PET-CT Covered Under Aarogyasri?
- Is PET-CT Worth the Cost Compared With a CT Scan?
- Is a PET-CT Scan Covered by Health Insurance in India?
- PET-CT Cost for Non-Cancer Conditions
- PET-CT Cost vs CT, MRI and Bone Scan in Hyderabad
- PET-CT Scan Cost in Hyderabad: The Full Price List
- PSMA, DOTATATE and FAPI PET-CT Costs in Hyderabad
- Paying for a PET-CT Scan From Abroad
- Planning the Cost of Your Cancer Diagnostics
- Repeat PET-CT Scans: What Each Follow-Up Costs
- Value for Money vs Deep Detect: Which PET-CT Should You Choose?
- What Does the Free Consultation With Your Scan Include?
- What Is Included in a PET-CT Scan Price — and What Is Not
- Why Do PET-CT Prices Vary So Much Between Centres?
- Why PET-CT Insurance Claims Get Rejected
Reports, Records & Second Opinions
- Comparing a New Scan With Your Previous One
- Do You Need a Repeat Scan or Just a Re-Read?
- Errors and Corrections in Scan Reports
- Getting a Second Opinion on Your PET-CT Report
- How to Get a Digital Copy of Your PET-CT Images
- Keeping Your Scan Records for the Long Term
- Sharing Your Scan With a Doctor Abroad
- Taking Your PET-CT Report to Another Hospital
- Understanding the Nuclear Medicine Specialist's Role
- What You Receive: Report, Images, CD and DICOM
- What to Do If the Report Says Something You Do Not Understand
- When Is a Second Opinion on a Scan Worth It?
- When Will You Get Your PET-CT Report?
- Why Two Reports on the Same Scan Can Differ
Your next step
Talk to an oncologist about your scan
Your PET-CT report read by a senior oncologist, explained in plain language, with a free 45-minute consultation.
Common questions
Frequently asked questions
What are the four reasons a doctor orders a PET-CT?
The four main reasons are: to stage a cancer and establish how far it has spread before treatment starts; to check whether treatment is working by comparing scans before and after; to look for recurrence after treatment has ended; or to investigate a finding that was unclear on a CT or MRI. Knowing which reason applies to you is the most useful piece of context to have before the scan — ask your doctor directly.
Will the scan tell me whether the cancer has spread?
If the scan was ordered for staging, then yes, that is exactly what it is designed to show. A PET-CT is particularly useful for detecting spread to lymph nodes and other organs because it shows metabolic activity rather than size alone. The result is always interpreted by a qualified doctor alongside your full clinical picture — the report does not deliver a standalone verdict.
Is PET-CT available at CION?
Yes. CION coordinates PET-CT through partner imaging centres in Hyderabad. Your oncology team manages the referral; the report comes back to your doctor, who will review it with you at your next consultation. You do not need to find a centre or manage the process yourself.
How long does the whole appointment take?
Allow two to three hours in total. This includes the tracer injection, a waiting period of around 45 to 60 minutes while it distributes through your body, and the scan itself, which usually takes 20 to 30 minutes. The waiting period is the part most people do not expect — you will be in a quiet room and should not exercise or move around during this time.
What if the scan shows something unexpected?
Your oncologist will review anything the scan finds, including findings outside the original area of interest, and will tell you whether any of them need further investigation. Many unexpected findings turn out to be caused by inflammation or normal variation. If follow-up is needed, your team will explain what it means and what happens next — you will not be left to interpret a report on your own.
I am worried about radiation. Is this scan safe?
The radiation involved is real, and it is a factor your oncologist has already weighed against the clinical benefit of the information the scan provides. Your team would not order it if that information were not necessary for your treatment decisions. If you have specific concerns, ask your oncologist to explain the clinical reason for the scan — a clear explanation of why it is needed is a reasonable thing to expect.