Myths vs facts: FT4 and Wechseljahre

FT4 (free thyroxine) is a key thyroid marker often discussed in the context of menopause or perimenopause. Fact: Menopause itself does not directly alter FT4 production, but declining estrogen levels affect thyroid-binding globulin, which can lead to a relative increase in free T4. Myth: Many believe that elevated FT4 during menopause automatically indicates hyperthyroidism. In reality, reference ranges are not menopause-specific, and mild fluctuations are common. Another myth: FT4 alone is sufficient to assess thyroid function. During menopause, TSH and possibly fT3 should also be evaluated because overlapping symptoms (fatigue, hot flashes) can stem from either hormonal shifts or thyroid dysfunction. Evidence is moderate: observational studies show associations, but no strong causal link. Caveat: Do not self-treat based on FT4 values; always consult a doctor for a full thyroid panel and clinical assessment.