Evidence check: SHBG in the context of Fruchtbarkeit

SHBG (sex hormone-binding globulin) is a key regulator of free testosterone and estradiol bioavailability. In the fertility context, SHBG plays a significant role: low SHBG is commonly linked to insulin resistance, obesity, and PCOS – all factors that impair female fertility. In men, low SHBG can elevate free testosterone, which paradoxically may be associated with reduced sperm quality. High SHBG (e.g., in hyperthyroidism or liver disease) reduces free sex hormones and can also disrupt fertility. The evidence for these associations is robust (human-strong), but SHBG alone is not a diagnostic marker. MyBody-X may include SHBG in its hormone panel, but interpretation requires clinical correlation with other parameters (LH, FSH, estradiol, testosterone, insulin). A single measurement is subject to circadian and cycle-dependent variation. Caveat: direct-to-consumer tests cannot replace a medical workup for infertility. The provided context lacks specific SHBG references, so this answer is based on widely accepted literature.