Cancer Antigen (CA) 15-3 Blood Test

Compare labs

Feature	Labcorp	Quest Diagnostics
Price	$39.49	$39.49
Results in	~2 business days	~5 business days
Sample type	Blood Serum	Blood Serum
Require fasting	No	No

About the test

CA 15-3 (Cancer Antigen 15-3) is a protein that may be elevated in the blood of individuals with certain types of cancer, especially breast cancer. It is primarily used to monitor response to treatment and detect recurrence rather than for initial diagnosis, as levels can also be elevated in non-cancerous conditions.

Included biomarkers & Reference ranges

Biomarker	Reference range
Cancer Antigen 15-3 (CA 15-3) A tumor marker used mainly to monitor breast cancer treatment and check for recurrence.	—

Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.

How it works

1. Order online No referral or insurance
2. Get a requisition By email in 24–72 hours
3. Visit a draw center Bring a matching photo ID
4. Get results Securely by email

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Consultations

Not sure how to read your results? We can help.

Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.

Book a specialist