# Triiodothyronine (T3)

> This test measures the level of triiodothyronine (T3), a hormone produced by your thyroid gland that helps control how your body uses energy. It helps show whether your thyroid is overactive, particularly in cases where other thyroid tests appear normal despite symptoms like unexplained weight loss or a rapid heartbeat.

- Labcorp code: 002188
- 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=002188&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.