Myths vs facts: FT3 and menopause

FT3 (free triiodothyronine) is a thyroid hormone often discussed in the context of menopause. A common myth is that low FT3 is directly caused by menopause and explains symptoms like fatigue or weight gain. In reality, estrogen decline during menopause affects thyroid-binding globulin, which influences total T3/T4 but not necessarily free FT3. Thyroid function can change with age, but isolated low FT3 without abnormal TSH and fT4 is rarely a standalone menopause issue. Another myth is that measuring FT3 alone suffices to assess thyroid status during menopause. Fact: A full thyroid panel (TSH, fT4, fT3, antibodies) is needed. MyBody-X offers hormone tests, but evidence for FT3 as a specific menopause marker is weak. Caveat: Do not self-diagnose; consult a doctor for symptoms.