# Thyroxine (T4), Free, Direct

> This test measures the amount of free thyroxine (T4) in your blood, which is the active form of thyroid hormone available for your body to use. It helps show how well your thyroid gland is regulating your metabolism and energy levels.

- Labcorp code: 001974
- Category: [Thyroid](https://picardo.health/labs/tests/thyroid.md)
- Sample: blood
- Labcorp turnaround: within 1 day
- 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=001974&ref=assistant
- Already in these panels: [Thyroid & Autoimmunity](https://picardo.health/labs/panels/thyroid-autoimmunity.md)

## 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.