What role does FT3 play in menopause?

The provided context does not contain specific information on the role of FT3 in menopause. FT3 (free triiodothyronine) is the active thyroid hormone regulating metabolism. During menopause, declining estrogen can affect thyroid hormone binding and conversion, potentially altering FT3 levels. However, FT3 alone is not a validated marker for menopausal symptoms or risk assessment. While thyroid dysfunction is more common in perimenopause and menopause, direct causal links between FT3 levels and specific symptoms (e.g., hot flashes, mood changes) remain unclear. Evidence is rated as unclear because the given sources do not address this question. Clinical evaluation should include TSH, fT4, and possibly antibodies, not isolated FT3. Be cautious of marketing claims positioning FT3 as a 'key hormone' of menopause without robust scientific backing.