What to watch with SHBG and Müdigkeit?

SHBG (sex hormone-binding globulin) modulates the bioavailability of testosterone and estrogen. In the context of fatigue (Müdigkeit), both low and high SHBG can be relevant. Low SHBG is often linked to insulin resistance, obesity, and metabolic syndrome—conditions that commonly cause tiredness. High SHBG may indicate hyperthyroidism, liver disease, or low androgen levels, which can also contribute to fatigue. However, SHBG alone is not a specific fatigue marker. Interpretation requires a full panel including total/free testosterone, estradiol, TSH, liver enzymes, and fasting insulin. Caveats: SHBG levels are influenced by medications (e.g., oral contraceptives, antiepileptics) and diet (e.g., very low-carb diets). A single SHBG measurement without clinical context is of limited value. For persistent fatigue, a comprehensive medical workup is recommended rather than relying solely on SHBG.