# Cancer Antigen (CA) 27.29

> This test measures the amount of CA 27.29, a protein often released into the bloodstream by breast cancer cells. It is primarily used to monitor patients who have already been treated for breast cancer to help determine if the treatment is working or if the disease is returning. Rising levels over time can signal a recurrence, while stable levels generally suggest the condition is under control. However, this test cannot diagnose breast cancer on its own and is not used to screen the general public for the disease.

- Labcorp code: 140293
- Category: [Cancer Detection](https://app.picardo.health/labs/tests/cancer-detection.md)
- Price: shown at checkout, before payment.
- Blood draw: free at a Labcorp location, or $75.00 at home.
- Order link: https://app.picardo.health/labs/order?tests=140293&ref=assistant

## About ordering

A licensed physician reviews every order before any test is run, and results arrive in the person's Picardo account. Ordering is open to adults 18 and over in the US, except New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii and Maine. General health information, not medical advice.