Thyroid
Free T3
Also written as Free triiodothyronine.
Extended panel — run periodically
What it indicates
The unbound form of the more active thyroid hormone.
Why a series helps
It responds to illness and to energy intake, so repeated readings separate a temporary dip from a pattern.
What this page does not tell you
What a particular Free T3 result means depends on you: your history, your medication, why the test was taken. Ziro does not interpret results for individuals and does not diagnose. If something in your results warrants a conversation, that conversation is with a doctor, and your results are downloadable so you can bring them.
Others in thyroid
The hormones that set the pace of your metabolism.