Is SHBG useful for fertility?

SHBG (sex hormone-binding globulin) is a carrier protein for testosterone and estradiol. In fertility contexts, SHBG can offer indirect clues: low SHBG is often linked to insulin resistance, metabolic syndrome, or PCOS—all factors that can impair fertility. High SHBG may be seen in liver disease, hyperthyroidism, or estrogen dominance. However, SHBG alone is not a diagnostic marker for fertility. Interpretation requires a full hormonal profile (free testosterone, LH, FSH), cycle phase, and clinical assessment. Home tests provide a snapshot but are not diagnostic. The evidence is mechanistic (physiological role); strong prospective studies validating SHBG as a standalone fertility predictor are lacking. Thus, SHBG can be useful as part of a comprehensive workup, but not as a sole indicator. Caveat: consumer tests often market SHBG without clinical context; always consult a specialist for meaningful interpretation.