/WHAT_IT_IS
Free T4 is the storage form of thyroid hormone — most of it gets converted to T3 in tissues.
/NORMAL_RANGE
Reference: 0.8–1.8 ng/dL.
What does high Free T4 mean?
- +Hyperthyroidism, T4 supplementation.
What does low Free T4 mean?
- +Hypothyroidism, severe illness.
/ON_TRT
Pair with TSH and free T3 for a complete thyroid picture.
/RELATED
/TRACK_THIS
Track Free T4 in the app.
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