# Triiodothyronine (T3), Free, Dialysis and LC/MS-MS (Endocrine Sciences)

> This test measures the amount of free T3, which is the active thyroid hormone available for your body to use. It uses a specialized technique to ensure accuracy even when other factors in your blood might interfere with standard tests.

- Labcorp code: 503600
- Category: [Thyroid](https://picardo.health/labs/tests/thyroid.md)
- Sample: blood
- Labcorp turnaround: 6–10 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=503600&ref=assistant

## 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.