# Protein S Antigen

> This test measures the amount of Protein S in your blood, a substance that helps prevent dangerous blood clots from forming. It is useful for determining if a shortage of this protein is causing unexplained clots or contributing to a family history of clotting disorders.

- Labcorp code: 164517
- Category: [Heart & Metabolic](https://picardo.health/labs/tests/heart-metabolic.md)
- Sample: blood
- Labcorp turnaround: 2–3 days
- Collection: free at a Labcorp location, or $75.00 at home.
- Without a doctor: yes. People order it themselves, with no doctor's visit or referral.
- Price: shown on the review page its order link opens. Opening it orders nothing.
- Order link: https://app.picardo.health/labs/order?tests=164517&ref=assistant

## Results reported (2)

- Protein S, Total
- Protein S, Free

## About ordering

People order for themselves, with no doctor's visit or referral, and results arrive in their 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.