← Catalogue
Thyroid · 09 / 30
Free T4 (FT4)
MeasuredFemale panel only (panel configuration)
The free fraction of thyroxine produced by the thyroid.
What it measures
The free fraction of thyroxine produced by the thyroid.
Why it is used
Together with TSH it helps interpret thyroid function.
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.