/WHAT_IT_IS
Free T3 is the biologically active thyroid hormone. TSH alone can miss thyroid dysfunction — measuring free T3 catches more cases.
/NORMAL_RANGE
Reference: 2.3–4.2 pg/mL. Optimal: upper half of range.
What does high Free T3 mean?
- +Hyperthyroidism, T3 supplementation.
What does low Free T3 mean?
- +Hypothyroidism, T3 conversion issues, chronic dieting.
/ON_TRT
If TSH is normal but you have hypothyroid symptoms on TRT, check free T3. Some men have impaired T4→T3 conversion and need T3-containing thyroid replacement.
/RELATED
/TRACK_THIS
Track Free T3 in the app.
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