Thyroid
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Free T3
Free T3 is the bioactive thyroid hormone. Measure when TSH is borderline or symptoms suggest poor T4→T3 conversion.
Optimal range
Range varies by individual.
Why this biomarker matters
Free T3 should sit in the upper half of the reference range. Low free T3 with normal TSH often reflects chronic stress, undereating, or selenium/iron insufficiency.
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