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Medical Wiki

Free T4

A thyroid hormone measure used with TSH to describe thyroid-axis state.

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What it is

Free T4 measures unbound thyroxine, one thyroid hormone signal.^[1]

Why it matters

It helps show thyroid hormone output and is often interpreted with TSH as part of thyroid-axis context.^[1]

What it affects

It links thyroid state to energy, temperature, heart, and neurological context.^[1]
It is a hormone-output node downstream of thyroid regulation.^[1]

Interpretation traps

Assay method, binding-protein context, pregnancy, medications, and illness can matter.^[1]
BioConst does not interpret personal free T4 results.^[1]