Reading your PET-CT report
'No Abnormal FDG Uptake': — Is That a Clear Scan?
Seeing 'no abnormal FDG uptake' in a PET scan report is generally good news. It means the scan did not find areas behaving the way active cancer typically does. But the phrase has limits, and understanding them helps you ask the right questions at your next appointment.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- It is good news — The scan found no areas absorbing the radioactive tracer at an abnormally high rate.
- It is not a guarantee — Some tumours absorb very little FDG and may not appear on a PET scan even when present.
- Size matters — Very small deposits may fall below what a PET scanner can reliably detect.
- Context decides meaning — Your oncologist reads this result alongside your full clinical picture, not as a standalone answer.
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'No abnormal FDG uptake' means the PET scan did not find areas where tissue was absorbing the radioactive tracer at a higher-than-expected rate — the pattern associated with active cancer. It is a reassuring phrase. It does not rule out all cancer, because not every tumour absorbs FDG strongly, and very small areas may not show up.
What do 'FDG', 'uptake' and 'abnormal' actually mean?
- FDG
- Fluorodeoxyglucose — a radioactive form of sugar injected before the scan. Cancer cells and some other metabolically active tissues absorb it faster than normal cells, which is what the scanner detects.
- Uptake
- How much of the FDG a tissue absorbs. High uptake means the tissue is using a lot of energy. Low uptake means it is relatively quiet metabolically.
- Abnormal uptake
- An area where FDG absorption is significantly higher than expected for that part of the body — a finding the radiologist investigates and reports on.
- No abnormal FDG uptake
- The scan found no areas with the pattern of unusually high tracer absorption. No areas triggered concern based on their metabolic activity at the time of the scan.
- FDG-avid
- A tumour described as FDG-avid absorbs a lot of the tracer and shows up clearly on PET. A tumour that is not FDG-avid absorbs little and may not appear even when present.
- Background activity
- Normal FDG uptake in organs such as the brain, heart, and kidneys. The radiologist compares all findings against this baseline to decide what counts as abnormal.
When does a PET scan detect well, and when can it miss things?
| Situation | PET-FDG tends to detect | PET-FDG may miss |
|---|---|---|
| Tumour size | Larger deposits with clear metabolic activity | Very small deposits below the scanner's resolution |
| Tumour type | Fast-growing, metabolically active tumours | Slow-growing or poorly FDG-avid types such as certain mucinous tumours, some well-differentiated thyroid cancers, and some prostate cancers |
| After treatment | Active residual disease if metabolically present | Microscopic residual disease; treatment-related inflammation can also alter the image |
| Scan timing | When tumour is metabolically active | In the days immediately after chemotherapy or radiation, when uptake patterns may be temporarily altered |
Does 'no abnormal FDG uptake' mean the cancer is gone?
It means the scan found no areas behaving the way active, FDG-avid cancer typically does. That is meaningful and is generally a positive finding.
It does not mean with certainty that no cancer cells remain anywhere. A PET scan measures metabolic activity, not individual cells. Very small deposits and tumours that absorb little FDG may not register, even when present.
Your oncologist will read this result alongside your blood markers, clinical examination, and previous imaging before drawing any conclusions. The phrase 'no evidence of metabolically active disease' means the same thing and may also appear in your report.
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What happens next after this kind of result?
Your oncologist reviews the result as part of your full assessment. It may confirm that a treatment is working, support a decision to continue or complete a course of therapy, or inform how closely you will be monitored.
Follow-up scans are often scheduled to track whether the result holds over time. A single clear scan is a point-in-time picture; repeated clear scans over months build a more confident picture.
Bring your complete report to your appointment and ask your oncologist to explain what this specific result means for your next step.
Did you know?
Not all cancers absorb FDG reliably. Some tumour types — including certain well-differentiated thyroid cancers, mucinous tumours, and some prostate cancers — are known to be poorly FDG-avid.
For these cancers, a radiologist may note in the report that a PET-FDG scan has limitations and recommend a different imaging approach alongside it.
Source: EANM/SNMMI practice guidelines on FDG-PET/CT imaging in oncology
Questions families often ask after a clear-looking PET result
My last scan showed cancer. Does this mean I am now in remission?
A result of no abnormal FDG uptake is consistent with what oncologists call a metabolic response — meaning no areas of active FDG-avid disease were visible at the time of the scan. Whether this meets the criteria for remission depends on your cancer type, how remission is formally defined in your situation, and what other investigations show. Your oncologist uses clinical criteria alongside the scan to reach that determination. The result is an important input, not the full answer.
Can I stop treatment if the scan looks this good?
That decision belongs to your oncologist and is based on far more than a single scan. It includes your cancer type, the treatment you are on, how long you have been on it, and what the evidence says about stopping early for your specific situation. A clear scan during treatment is encouraging and informs that conversation — it does not decide it. Please do not adjust, pause, or stop your treatment based on a scan report alone.
Why is my doctor ordering more tests if the PET looks clear?
PET scanning has recognised limitations for certain cancer types and for very small deposits. Your oncologist may order a biopsy, MRI, CT, or blood markers to gather information that a PET scan cannot provide. This is not a sign that something is wrong — it is how oncologists build a complete picture before making major decisions. A clear PET scan reduces uncertainty; it does not always remove it.
The report says no abnormal uptake but also mentions other findings. Which matters more?
A PET-CT report contains both metabolic findings from the PET component and structural findings from the CT component. Both matter, and they can tell different stories. An area with no abnormal FDG uptake but a visible structural change may still need follow-up investigation. Your oncologist reads the full report, not just the headline phrase. Bring the complete document to your appointment and ask them to walk through each finding with you.
Should we get a second PET scan to confirm this result?
A repeat scan is sometimes appropriate — for example if the result is unexpected given your clinical picture, if the timing of the scan may have affected the findings, or if your oncologist wants to establish stability over time. Whether and when to repeat it is a clinical decision. If you feel uncertain about the result, it is entirely reasonable to ask your oncologist whether a follow-up scan is planned and when.
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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
Does 'no abnormal FDG uptake' mean I am cancer-free?
It means the PET scan found no areas absorbing the radioactive tracer at an abnormally high rate — the pattern associated with active cancer. That is a meaningful and generally positive finding. It does not confirm with certainty that no cancer cells remain, because very small deposits and tumours that absorb little FDG may not show on a PET scan. Your oncologist will interpret this result alongside your full clinical picture before drawing conclusions about your status.
Which cancers might not show up on a PET scan even when present?
Some tumour types are poorly FDG-avid, meaning they absorb little of the radioactive tracer and may not appear on a PET scan even when active disease is present. Examples include certain well-differentiated thyroid cancers, mucinous tumours, some lobular breast cancers, and some prostate cancers. Your radiologist and oncologist will know whether your specific cancer type has this limitation and may recommend additional imaging alongside the PET to provide a more complete picture.
What is the difference between 'no abnormal FDG uptake' and 'complete metabolic response'?
'Complete metabolic response' is a more formal term used in structured response assessment — for example, the Deauville criteria in lymphoma or PERCIST in solid tumours — meaning all previously identified areas of abnormal FDG uptake have resolved to background levels. 'No abnormal FDG uptake' is a broader descriptive phrase and its precise significance depends on context. Ask your oncologist which criteria apply to your cancer type and what your specific result means under those criteria.
Why would my doctor order a biopsy after a clear PET scan?
A PET scan shows metabolic activity — how tissues behave — not their cellular composition. A biopsy reveals what cells are present. For some decisions, particularly about changing or stopping treatment, tissue analysis provides information the scan cannot. A clear PET scan may reduce the likelihood of finding active disease on biopsy, but it does not replace the information a biopsy provides. Your oncologist will explain the specific reason if they recommend one.
Can a PET scan miss a recurrence?
Yes, in certain situations. Very small areas of recurrence may fall below what the scanner can reliably detect. Cancers that are not FDG-avid may recur without producing a visible PET signal. And the timing of the scan relative to recent treatment can alter what appears. This is why oncologists often use PET alongside other investigations — blood markers, clinical examination, and sometimes CT or MRI — rather than relying on any single test alone.
Is PET-CT scanning available at CION, and who explains the result to me?
CION coordinates PET-CT scans through partner imaging centres across Telangana and Andhra Pradesh. Your oncologist at CION arranges the scan and receives the report. They will explain what findings like 'no abnormal FDG uptake' mean in the context of your specific cancer, your treatment history, and what comes next. The radiologist who writes the report describes what they see; your oncologist interprets what it means for your care.