CA 15-3 (Breast cancer marker)
CA 15-3 is a glycoprotein made by breast glandular epithelium, measured as a longitudinal benchmark during clinical monitoring.
Test your personal value
Enter the number from your lab report to instantly see how it compares to reference ranges.
Physiological Reference Ranges
The ranges below represent standard adult physiological values. Your laboratory's printed reference range always takes precedence.
0 – 30 UI/mL
0 – 30 UI/mL
0 – 30 UI/mL
What does a low result mean?
A reading under 30 UI/mL is the typical, healthy physiological baseline.
What does a high result mean?
A mild elevation is often associated with benign breast variations (fibroadenomas, cysts), pregnancy, or minor hepatic shifts.
Questions ready for your doctor
Bring these questions to your next consultation to discuss with your healthcare practitioner:
- Could benign breast changes (such as simple cysts) account for this number?
- Does this align reassuringly with my regular mammography imaging?
- Is a follow-up assessment indicated?
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Important information — Medical notice
ScanMyLab is for informational purposes only. It does not provide a diagnosis and never replaces the advice of your doctor or laboratory.