No. The result should be interpreted with symptoms, medical history, assay method and related tests.
Information about a laboratory test
CA 15-3 High Result: What Does It Mean?
A high tumor marker does not diagnose cancer on its own; benign conditions and other causes can also raise the level.
Test summary
- Test name
- CA 15-3
- Abbreviations
- CA 15-3, CA15-3
- Category
- Tumor Markers / Oncology
- Panel
- Tumor Marker Monitoring
- Specimen
- Serum / plasma
- Common units
- U/mL
What does the test measure?
CA 15-3 measures the relevant tumor marker in blood.
Why is the test ordered?
CA 15-3 may be used with other clinical information for especially monitoring treatment response and disease course in advanced breast cancer.
Information about a low result
A low/normal tumor marker does not rule out cancer by itself.
Information about a high result
A high tumor marker does not diagnose cancer on its own; benign conditions and other causes can also raise the level.
Reference and clinical context
Start with the performing laboratory's reference or decision range, assay method, specimen and reporting unit. A single result usually does not establish a diagnosis on its own.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
Interpretation notes
Tumor markers are often more useful for monitoring known disease and selected clinical evaluations than as stand-alone diagnostic tests.
Related specialties
- Oncology
- Internal Medicine
Frequently asked questions
Sources
Tumor Marker Tests — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2025 · General tumor marker uses and limitations, including CA 15-3 · Verified: Aug 12, 2026
Tumor Marker Tests in Common Use — National Cancer Institute
U.S. government cancer reference · 2023 · Common tumor markers and typical monitoring uses · Verified: Aug 12, 2026
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