Trusted-source health topic
Understanding Tumor Markers
Tumor markers are substances or changes that may be measured in blood, urine, tissue, or other specimens in selected cancer-care contexts.
Why is this important?
Understanding the purpose and limits of laboratory information can support a more informed conversation with a qualified healthcare professional.
How laboratory testing relates
Many markers may be affected by non-cancer conditions and generally cannot diagnose cancer alone. Their role depends on the marker, clinical question, and other findings.
Before testing
Preparation is test-specific. Follow the instructions given for the exact test and contact the laboratory if fasting, timing, medicines, or specimen collection is unclear. Do not stop medicines unless a qualified professional tells you to.
Educationally related laboratory guides
These links explain related laboratory records. They are not recommendations to request or purchase a test.
Sources & further reading
- MedlinePlus, U.S. National Library of Medicine: Tumor Marker Tests
External authoritative patient reference · Verified 2026-08-10
- U.S. National Cancer Institute: Tumor Markers in Common Use
External authoritative patient reference · Verified 2026-08-10
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