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Thyroid · 08 / 30
Free T3 (FT3)
MeasuredFemale panel only (panel configuration)
The free fraction of triiodothyronine, the active thyroid hormone.
What it measures
The free fraction of triiodothyronine, the active thyroid hormone.
Why it is used
Helps assess some thyroid disorders.
Interpretation note
Rythm's published panel marks it for women only. This is a product panel choice, not a medical restriction.
Availability
Under validation. Inclusion in any offer depends on the partner laboratory's validation and the sample volume. It cannot be ordered yet.
Read together with
Sources
Rythm Health's public “What we test” list (checked 15.10.2026) and the preliminary Tasso+ product study for Kosovo.