Response assessment
PET-CT to Check — Whether Treatment Is Working
When your oncologist orders a PET-CT after a few cycles of treatment, they are not starting from scratch. They are comparing your tumour to the scan taken before you began — to see whether its metabolic activity has changed.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- A comparison, not a new diagnosis — The scan only tells you something meaningful when placed alongside your baseline scan from before treatment started.
- Metabolic activity is what is measured — The scan tracks how actively cells use glucose — cancer cells typically take up more than the healthy tissue around them.
- Timing is decided by your oncologist — There is no single fixed point — your cancer type and treatment plan determine when the scan will be most informative.
- The result guides what happens next — A response scan tells your team whether to continue, adjust, or change your current treatment.
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A PET-CT ordered mid-treatment is a response-assessment scan. Your oncologist compares metabolic activity in your tumour to your baseline scan taken before treatment began. A reduction in activity means the tumour is responding. This comparison is the standard way NCCN and ESMO recommend assessing whether a treatment plan should continue.
CION offers PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city, with no hidden charges. Indicative price, as of September 2026.
When does your oncologist order a response-assessment PET-CT?
A response-assessment PET-CT is usually ordered after enough treatment cycles for an effect to be visible — but not so many that a treatment that is not working continues unnecessarily.
The exact timing depends on your cancer type and the treatment you are on. For some cancers, a scan after a set number of cycles is part of the standard approach. For others, it is ordered when your team wants to check progress or when your symptoms have changed.
If you do not know why the scan has been ordered at this point, ask your oncologist before the appointment. A clear answer to that question is reasonable to expect.
What is being compared — and what counts as a good result?
The scan is placed beside your baseline PET-CT — the one taken before treatment started. Your oncologist looks at how much radiotracer the tumour is absorbing now compared to then.
A good result is a clear reduction in metabolic activity. Complete response means no detectable uptake where the tumour was. Partial response means uptake has fallen significantly. Stable disease means it has not changed much. Progressive disease means uptake has increased or new areas have appeared.
No scan result is read alone. Your oncologist considers it alongside your blood tests, clinical examination, and how you have been feeling. The report from the partner imaging centre is interpreted by a qualified doctor before any treatment decision is made.
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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MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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What do the words in your PET-CT report mean?
- Baseline scan
- The PET-CT taken before treatment started. Every response scan is compared against this image.
- Metabolic activity
- How actively cells are taking up glucose. Cancer cells usually take up more than the healthy tissue around them, which is what makes them visible on the scan.
- SUV (Standardised Uptake Value)
- A number that describes how much tracer a tissue absorbs. A falling SUV across scans suggests the tumour is responding to treatment.
- Complete metabolic response
- No detectable uptake in the area where the tumour was. The best possible scan result.
- Partial response
- Uptake has reduced significantly but not disappeared. The treatment is having a measurable effect.
- Stable disease
- Uptake has not changed meaningfully — neither better nor clearly worse than the baseline scan.
- Progressive disease
- Uptake has increased, or new areas of uptake have appeared. The current treatment is not controlling the cancer and the plan needs to be reviewed.
- Deauville score
- A five-point scale used specifically in lymphoma to grade residual uptake after treatment. Your oncologist will explain what your score means for your situation.
What else should you know about response-assessment scans?
Does a complete response on PET-CT mean the cancer has gone?
A complete metabolic response means no detectable tumour activity on this scan at this point in time. It is a very encouraging result. It does not mean a guarantee that no cancer cells remain anywhere — PET-CT detects metabolic activity above a certain threshold, not individual cells. Your oncologist will explain what it means for your specific cancer type and whether further treatment or surveillance is the appropriate next step.
Why does the scan need to be done at a specific centre?
Response assessment works by comparison, so consistency matters. The same tracer preparation, the same scanner calibration, and the same imaging protocol make it possible to measure a real change rather than a difference caused by the equipment. CION coordinates response-assessment PET-CT scans through partner imaging centres in Hyderabad. If your baseline scan was done at a different facility, tell your oncologist — they will advise whether the comparison is still valid or whether a new baseline is needed.
Will the result change my treatment immediately after the scan?
Not always, and not on the day of the scan. Your oncologist reviews the written report from the imaging centre alongside your clinical picture before making any recommendation. Some results confirm that treatment should continue unchanged. Others prompt a conversation about adjusting the plan. You should expect a scheduled meeting to discuss the result and what it means — not a phone call with a decision already made before you have spoken.
My oncologist mentioned a Deauville score — what is that?
The Deauville score is a standardised five-point scale used primarily in lymphoma to describe how much FDG uptake remains after treatment, measured against a reference organ in the body. It was developed to make PET-CT response reporting more consistent between centres and between doctors. A lower score generally reflects a better response. If you have lymphoma, ask your oncologist what your specific score was and what it means for your next treatment decision.
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad — across 4 partner centres in Banjara Hills, Punjagutta, Himayatnagar and Narayanaguda. 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
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Common questions
Frequently asked questions
How many cycles of chemotherapy before a PET-CT is done to check response?
There is no single number that applies to all cancers or all treatment plans. The timing is decided by your oncologist based on your cancer type and the treatment you are on. For some cancers, interim response assessment after a set number of cycles is part of the standard approach recommended by NCCN or ESMO. For others, the scan is ordered when your team has a specific clinical reason to check. Ask your oncologist why the scan is being done at this point and what they are hoping to learn from it.
What does stable disease mean — is that a bad result?
Stable disease means the tumour has not grown or spread, but it has not responded clearly either. Whether that is a good or bad result depends on the cancer type, the treatment, and what your oncologist expected at this stage. For some cancers, keeping the disease stable is a meaningful outcome. For others, a stable result at an interim scan may prompt your team to reconsider the plan. Ask your oncologist directly what stable disease means in your specific situation.
Is a partial response a failure?
No. A partial response means the treatment is having a measurable effect — metabolic activity has fallen significantly. For many cancers and treatment plans, a partial response at an interim scan is exactly what is hoped for, and treatment continues with the aim of deepening that response. Whether it is sufficient depends on your cancer type and what the treatment is intended to achieve. Your oncologist will explain what it means for your plan going forward.
What happens if the PET-CT shows the treatment is not working?
Progressive disease on a response-assessment scan means your oncologist needs to review the treatment plan. That does not mean running out of options — it means the current approach is not right for this tumour and something else should be tried. Your oncologist will discuss what the alternatives are, which may include a different regimen, a clinical trial, or a referral for a second opinion. Finding this out sooner rather than later is the reason the scan is done.
Where will my response-assessment PET-CT be done?
CION coordinates PET-CT scans through partner imaging centres in Hyderabad. PET-CT requires specialised equipment and radiopharmaceuticals that need their own dedicated facility — it is not carried within a day-care oncology centre. Your CION team will tell you which centre your scan is booked at and what you need to do to prepare. If you have had previous scans at a different facility, mention this to your oncologist so they can advise whether the results can be reliably compared.
How long after the scan will I get the result?
The imaging centre produces a written report, which your oncologist receives and reviews before discussing it with you. The time this takes varies depending on how quickly the report is available and when your next appointment is scheduled. In most cases, you should expect to discuss the result within a few days of the scan. If you have not heard anything and your appointment is approaching, contact your CION team to confirm the report has been received.