Thyroid
Free T4
Also written as Free thyroxine.
Core panel — run every month
What it indicates
The unbound form of the main hormone the thyroid releases.
Why a series helps
It is steadier than TSH, so following the two together shows more than either one alone.
What this page does not tell you
What a particular Free T4 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.