T4 Free
- Thyroid
Learn what T4 Free measures and how it fits into your health data.
What is T4 Free?
Free Thyroxine (Free T4) measures the unbound, biologically active form of T4, the primary hormone produced by the thyroid gland. It reflects the amount of T4 available for tissues to use or convert to the more active T3. Free T4 levels are essential for assessing thyroid status, alongside TSH and potentially Free T3.
Testing options
Frequently ordered with:
Panels with this test:
Connect an AI agent
https://goodlabs.com/mcp/user
