What to watch with SHBG and Fruchtbarkeit?

SHBG (sex hormone-binding globulin) binds testosterone and estradiol, regulating their free, bioactive fractions. In fertility contexts, the SHBG level matters mainly in relation to total sex hormones. High SHBG reduces free testosterone, potentially lowering libido and sperm quality in men. Low SHBG in women often accompanies insulin resistance, metabolic syndrome, or polycystic ovary syndrome (PCOS), which can disrupt ovulation and endometrial receptivity. Thyroid dysfunction and liver disease also alter SHBG. However, SHBG alone is not a fertility marker; it must be interpreted alongside total testosterone, estradiol, LH, FSH, and clinical findings (cycle regularity, semen analysis, BMI). A single snapshot is insufficient for diagnosis. If SHBG is abnormal, consult a reproductive endocrinologist for comprehensive workup. Evidence: human-moderate – associations are established, but SHBG is not a standalone diagnostic test for fertility.