# 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. This measurement helps show whether your thyroid is overactive, a condition often associated with symptoms like rapid heartbeat or unexplained weight loss. While it helps rule out hyperthyroidism, this test cannot diagnose the specific cause of a thyroid problem on its own.

- Labcorp code: 503600
- Category: [Thyroid](https://app.picardo.health/labs/tests/thyroid.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=503600&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.