🎗️ Tumor Marker Interpretation
Reference upper limits, main associations and false-positive/negative limitations of common tumor markers. Browser-side reference — mostly for monitoring, not screening.
Most markers are for response/recurrence monitoring, not screening or diagnosis.
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When to use
Interpret a marker as a monitoring trend in a diagnosed patient, not as a screening or diagnostic test.
How it works
Examples: CEA < 5 ng/mL, AFP < 10–20, CA19-9 < 37 U/mL, CA125 < 35 U/mL, PSA < 4 ng/mL.
Key points
- Most markers are for response/recurrence monitoring, not screening or diagnosis.
- The dynamic trend beats a single value.
- Inflammation and benign disease commonly cause false positives.
- An elevation must be confirmed with imaging and pathology.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Marker | CEA |
|---|
→MarkerCEA (reference < 5 ng/mL, higher in smokers)
- Associations：Colorectal cancer (monitoring), gastric/pancreatic/lung/breast
- False positives：Smoking, inflammatory bowel disease, liver disease, pancreatitis
- Use：Response/recurrence monitoring, not screening
| Marker | General principles |
|---|
→MarkerGeneral principles
- Role：Most markers are for response assessment and recurrence monitoring, not population screening / standalone diagnosis
- Dynamics：The trend matters more than a single absolute value
- False positives：Inflammation, benign disease, hepatic/renal function and procedures can all raise levels
Frequently asked questions
- What is Tumor Marker Interpretation?
- Reference upper limits, main associations and false-positive/negative limitations of common tumor markers. Browser-side reference — mostly for monitoring, not screening.
- How is Tumor Marker Interpretation calculated? What is the core formula?
- Examples: CEA < 5 ng/mL, AFP < 10–20, CA19-9 < 37 U/mL, CA125 < 35 U/mL, PSA < 4 ng/mL.
- When is Tumor Marker Interpretation used?
- Interpret a marker as a monitoring trend in a diagnosed patient, not as a screening or diagnostic test.
- What are the key clinical points for Tumor Marker Interpretation?
- Most markers are for response/recurrence monitoring, not screening or diagnosis. The dynamic trend beats a single value. Inflammation and benign disease commonly cause false positives. An elevation must be confirmed with imaging and pathology.
- What are the limits and cautions when using Tumor Marker Interpretation?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Tumor Marker Interpretation calculated in practice? Can you show a worked example?
- Inputs: Marker CEA → Result: Marker CEA (reference < 5 ng/mL, higher in smokers)（Associations: Colorectal cancer (monitoring), gastric/pancreatic/lung/breast, False positives: Smoking, inflammatory bowel disease, liver disease, pancreatitis, Use: Response/recurrence monitoring, not screening） Inputs: Marker General principles → Result: Marker General principles（Role: Most markers are for response assessment and recurrence monitoring, not population screening / standalone diagnosis, Dynamics: The trend matters more than a single absolute value, False positives: Inflammation, benign disease, hepatic/renal function and procedures can all raise levels）