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Free T3

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Free T3

Free T3 is the active thyroid hormone that drives your metabolism and energy production. Testing this hormone helps uncover issues that may be causing fatigue, weight changes, or low energy levels, even when other thyroid markers seem normal.

Thyroid
Biomarker(s) tested:

Free T3 (free triiodothyronine)


Panel is drawn at Quest Labs. Locations are available nationwide.

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erica and kelsey
We are Root

We're a team of doctors and dietitians who solve hormone, gut, and autoimmune issues at the Root cause.


We empower you with the right information for a healthy lifestyle and healing from the inside out. We support you through our expert functional medicine guidance, online community, digital meal plans, and tried and true supplements straight from our own clinical protocols.
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