Reading your report
Should You Read Your PET-CT Report — Before the Consult?
You have the report. You are going to read it. This page is about reading it in a way that prepares you for the appointment rather than frightening you before it.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Reading is not the problem — Misinterpreting what you read is. These two things are separable.
- Some words alarm unnecessarily — Terms like 'avid' and 'hypermetabolic' sound worse than they are when read without context.
- Some words give false comfort — 'Stable' does not always mean what you hope. Your oncologist explains what it means for you.
- The report is a source of questions — Every phrase you do not understand is something to bring to the consult.
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Yes — and most people do. Reading your PET-CT report before your appointment is not wrong. What matters is knowing which words describe a finding and which words carry meaning only a doctor can provide. The report gives you the vocabulary. Your oncologist gives you the context.
What can a PET-CT report tell you — and what can it not?
| What the report tells you | What only your oncologist can tell you | |
|---|---|---|
| Areas of uptake | Which parts of the body showed activity and where | Whether that activity is caused by cancer, inflammation, or something else |
| SUV values | The number recorded at each site | Whether that number is significant for your specific cancer type |
| 'Suspicious' or 'likely' language | The radiologist's observation in standard terminology | What it means for your diagnosis and what happens next |
| Change from prior scan | Whether an area is larger, smaller, or unchanged | Whether that change is clinically meaningful for your treatment |
| Incidental findings | Other things the scan happened to see | Whether any of them need follow-up and how urgently |
What do the words in a PET-CT report actually mean?
- FDG-avid / avid uptake
- The area is absorbing the radioactive tracer used in the scan. Many things are FDG-avid — infections, healing tissue, and some normal organs. It does not automatically mean cancer.
- Hypermetabolic
- Showing higher metabolic activity than the surrounding tissue. It describes what the scanner recorded, not what is causing it.
- SUV (Standardised Uptake Value)
- A number measuring how much tracer an area absorbed. There is no universal safe or dangerous number — what matters is your cancer type, the body part, and how it compares to your previous scans.
- Incidental finding
- Something the scan detected that was not the reason for the scan. Most are harmless. Your oncologist will tell you whether yours needs follow-up.
- Stable / no significant interval change
- The area looks the same as on the previous scan. Whether stability is good news depends on the clinical context — ask your oncologist what it means for you.
- Progression
- Increased activity or new areas of concern compared to a previous scan. A radiological observation — your oncologist will discuss what it means for your treatment plan.
Which parts of the report are most often misread?
The SUV number is the one most people search online, and it is the one that means least in isolation. A number that looks alarming in a general search may be entirely expected for your cancer type and the body part being scanned.
'Hypermetabolic' and 'avid' are standard radiological language, not a verdict. They describe what the scanner recorded.
Do not skip the impression or conclusion section at the end of the report. That is where the radiologist summarises the most significant findings. Read it alongside the rest, not instead of it.
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How to use your report to prepare for the consult
- Write down every word or phrase you do not understand.
- Note anything described as 'new', 'increased', or 'suspicious' — bring these to the appointment.
- If the report compares to a previous scan, find that report too so you can ask about the comparison.
- Write your questions before you go in. It is hard to remember them in the room.
- Do not search individual numbers online — ask what your specific values mean for your cancer type.
- Tell your team if something in the report is worrying you, even if it seems small.
What if the report frightens you before the appointment?
Call the clinic and say so. If the report contains something that looks serious and the appointment is days away, your team can tell you whether it needs to be brought forward.
Avoid searching PET-CT terms alongside your diagnosis late at night. What you find will be general, and your situation is specific. The same word means different things in different cancers.
You do not have to pretend you have not read it. Walk into the consult with your questions written down and start with the one that is worrying you most.
Words and phrases that most often cause confusion
What does 'cannot exclude malignancy' mean?
It means the radiologist saw something but cannot say with certainty what it is from the scan alone. It is standard radiological caution, not a diagnosis. It means further investigation is likely — a biopsy, another scan, or monitoring — but what happens next is a clinical decision your oncologist will explain. Do not read it as confirmation of cancer.
The report says 'no evidence of disease' — does that mean I am in remission?
'No evidence of disease' means no metabolically active disease was visible on that scan on that day. It is a positive finding. Whether it amounts to remission, how durable it is likely to be, and what follow-up is needed depends on your cancer type and treatment history. Your oncologist uses the word 'remission' in context — the report does not.
There is a new finding in the report that was not mentioned before. Should I worry?
A new finding always needs discussing. Call the clinic if it is causing you significant anxiety — your team can tell you whether the appointment should be brought forward. New findings range from incidental and harmless to clinically important, and you cannot tell which from the report alone. Your team would rather you call than wait in distress.
Why does the radiologist's report sometimes differ from what my oncologist says?
The radiologist describes what the scan shows. They often do not have your full clinical history, your bloodwork, or your treatment detail. Your oncologist reads the report in the context of everything else they know about you. Two patients with similar-sounding reports can be given completely different plans — the scan is one piece of information, not the whole answer.
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Explore 94 more Understanding Your PET-CT Report topics
Reading Your Report: Core Terms
- 'Cannot Be Excluded' and Other Cautious Phrases
- 'Deauville Score' on a Lymphoma PET Report
- 'FDG Avid': What It Means on Your Report
- 'Hypermetabolic': What the Word Actually Means
- 'Hypometabolic' and 'Photopenic' Findings
- 'Impression' vs 'Findings': Which Section Should You Read?
- 'Interval Change' and 'Stable Since Previous Study'
- 'Krenning Score' on a DOTANOC or DOTATATE Report
- 'Lymphadenopathy' on Your PET Report
- 'Metabolically Active Disease': What It Tells You
- 'Metastasis' and 'Distant Spread' on Your Report
- 'Mildly FDG Avid' vs 'Intensely FDG Avid'
- 'No Abnormal FDG Uptake': Is That a Clear Scan?
- 'Physiological Uptake': Normal Areas That Always Light Up
- 'Residual Disease' vs 'Complete Metabolic Response'
- 'Sub-Centimetre Node' and Why Size Matters on PET
- 'Suspicious for Malignancy': How Certain Is That?
- How Long Does a PET-CT Report Take?
- How to Read Your PET-CT Report: A Section-by-Section Guide
- Should You Read Your Own PET-CT Report Before the Consult?
- TNM Staging on a PET-CT Report
- Why Your Report Mentions the Liver and Blood Pool
False Positives, False Negatives & Pitfalls
- Bladder, Kidney and Ureter Activity on PET
- Bone Marrow Uptake After Growth Factor Injections
- Bowel Uptake: Normal, Inflammation or Something Else?
- Brown Fat Uptake: A Common Cause of Confusing Findings
- Does a Suspicious PET Finding Always Need a Biopsy?
- Getting a Second Read of Your PET-CT Images
- How Often Is a PET-CT Scan Wrong?
- Muscle Uptake After Exercise or Injections
- Thymic and Rebound Uptake in Younger Patients
- Uptake After Radiotherapy: Inflammation or Disease?
- Uptake at a Biopsy or Surgery Site
- What Causes a False Negative on a PET Scan?
- What Causes a False Positive on a PET Scan?
- What Happens If Two Scans Disagree?
- Which Cancers Do Not Show Well on PET-CT?
- Why the Brain Always Lights Up on PET
Incidental Findings
- A Second Unrelated Cancer Found on PET-CT
- An Incidental Bone Finding on PET-CT
- An Incidental Breast Finding on PET-CT
- An Incidental Kidney or Adrenal Finding
- An Incidental Liver Lesion on PET-CT
- An Incidental Lung Nodule Found on PET-CT
- An Incidental Prostate Finding on PET-CT
- An Incidental Thyroid Nodule on Your PET Scan
- Do All Incidental Findings Need Investigation?
- Focal Bowel Uptake: Could It Be a Polyp?
- Incidental Findings on a PET-CT Scan: What They Are
- Incidental Heart Findings on a Cancer PET Scan
- The Cost of Chasing an Incidental Finding
- What to Ask Your Doctor About an Incidental Finding
Infection, TB & Inflammation on PET
- Can Tuberculosis Look Like Cancer on a PET Scan?
- Dental Infection and Jaw Uptake on PET
- Fungal Infection and Abscess on PET-CT
- How Long Should You Wait After an Infection Before a PET Scan?
- If It Might Be Infection, What Test Comes Next?
- Inflammation After Injections, Vaccines and Cannulas
- Old Healed TB and Calcified Nodes on PET-CT
- PET-CT for Fever of Unknown Origin
- PET-CT for Suspected Infection in Implants and Prostheses
- PET-CT for Vasculitis and Inflammatory Conditions
- Pneumonia and Recent Chest Infection on PET
- Sarcoidosis on PET-CT: The Great Mimic
- TB or Cancer? How Doctors Tell Them Apart
- Thyroid Uptake on PET: Diffuse vs Focal
Response Assessment Scores & Criteria
- Complete Metabolic Response: What It Means
- Deauville Score 1 to 5: The Lymphoma Scale Explained
- End-of-Treatment PET Scan: What It Decides
- How Doctors Judge Whether Treatment Is Working on PET-CT
- Interim PET Scan During Chemotherapy: Why It Is Done
- Metabolic Response vs Size Response: Why They Differ
- PERCIST Criteria: How Metabolic Response Is Measured
- Partial Metabolic Response: Is That Good Enough?
- Progressive Metabolic Disease: What Happens Next
- RECIST vs PERCIST: Size vs Activity
- Stable Metabolic Disease: Good News or Bad?
- Tumour Flare and Pseudoprogression on PET
- What Is a Deauville 3 and Why Is It Ambiguous?
- Why the Scan Says One Thing and You Feel Another
SUV Values Explained
- Comparing SUV Between Two Scans: Is It Meaningful?
- Does a Higher SUV Mean a More Aggressive Cancer?
- Factors That Change Your SUV Reading
- High SUV but Not Cancer: When the Number Misleads
- Is My SUVmax of 4 High? Reading Your Specific Number
- Low SUV but Still Cancer: The PET-Negative Cancers
- SUV in Non-Cancer Conditions
- SUVmax, SUVmean and SUVpeak: What Is the Difference?
- What Is SUV on a PET Scan?
- What Is a Normal SUV Value?
- What SUV Value Indicates Cancer?
- Why Blood Sugar Changes Your SUV Result
- Why Did My SUV Go Down but Not to Zero?
- Why Did My SUV Go Up After Treatment?
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Common questions
Frequently asked questions
What does SUV mean in a PET scan report and is mine high?
SUV measures how much tracer a particular area absorbed. A higher number means higher metabolic activity. Whether yours is significant depends on your cancer type, the area being scanned, and what the number was on previous scans. There is no universal threshold that is safe or alarming. Do not compare your number to a general online search — ask your oncologist what it means for you specifically.
Can I ask the imaging centre to explain my PET-CT report?
The radiologist can sometimes clarify what a finding means in radiological terms, but they cannot interpret the clinical meaning for your treatment — they do not have your full picture. For plain-language definitions of common words, this page covers the most frequent ones. For what the report means for your specific situation, your oncologist is the right person.
My PET scan says 'progression' — does that mean treatment has stopped working?
Progression is a radiological observation, not a clinical conclusion. It means there is increased activity or new areas compared to a previous scan. Whether treatment has stopped working and what comes next are questions your oncologist answers in the context of your full history. If your next appointment is days away and you are very worried, call the clinic and ask whether it can be brought forward.
Should I read my PET-CT report before or after the consult?
Most people receive the report before the appointment and read it. Reading it beforehand means you arrive with specific questions rather than trying to absorb everything in the room. The risk is spending days before the consult frightened by words that have not been explained. If you read it, write your questions down and focus on what you do not understand — save your conclusions for after the appointment.
Is it normal to not understand most of what the report says?
Yes, entirely. PET-CT reports are written for radiologists and oncologists, not for patients. The language takes years of training to interpret correctly. Not understanding it is not a failure — it is the expected response to a document not written for patients to read without support. The terms on this page cover the ones that come up most often.
What if the report mentions something my oncologist has not discussed?
Bring it to the appointment and ask directly. Oncologists focus on what is clinically significant and may not address every line in a consultation — but you have every right to a clear explanation of anything in your own report. Write the specific phrase down and raise it at the start of the appointment so it does not get left without time.