Thyroid Function
Free T4
Lab name: T4, Free (Direct) · LOINC 3024-7
1.2ng/dL
In rangeCollected Oct 20, 2026
Lab reference interval0.82–1.77 ng/dL
History
Shaded band shows the laboratory reference interval.
Compared with last time
Previous · Mar 19, 2026
1.25 ng/dL
In rangeLatest · Oct 20, 2026
1.2 ng/dL
In range-0.05 since Mar 2026
Free T4 is the active, unbound form of the main hormone produced by the thyroid.
Why it matters: Interpreted together with TSH.
Educational information only. It is not a diagnosis — please review your results with your clinician.