Myths vs facts: FT4 and Müdigkeit

The question about myths vs facts regarding FT4 (free thyroxine) and fatigue is not addressed in the provided context. From general medical knowledge: a normal FT4 does not rule out thyroid dysfunction as a cause of fatigue – subclinical hypothyroidism often presents with elevated TSH but still normal FT4. Conversely, elevated FT4 may indicate hyperthyroidism, which can also cause fatigue (along with other symptoms). A common myth is that FT4 alone is sufficient to assess thyroid function; in fact, TSH is the more sensitive marker. Another myth is that fatigue is always due to thyroid issues – many other factors (stress, sleep deprivation, diet) are involved. Without specific sources from the context, the evidence level is unclear. This answer is based on standard clinical practice, not on the provided documents.