Lab marker · High

High Sex hormone-binding globulin (SHBG): what it means

A Sex hormone-binding globulin (SHBG) result above the normal range is considered high. Here is what a raised Sex hormone-binding globulin (SHBG) can point to, and when it is worth discussing with a doctor.

Reference range: Men ~18–54, women ~18–144 nmol/L; interpreted together with total testosterone to estimate free hormone

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What a high Sex hormone-binding globulin (SHBG) can mean

  • Hyperthyroidism — thyroid hormone strongly raises SHBG.
  • Liver disease / cirrhosis — altered hepatic synthesis.
  • Estrogen (oral contraceptives, pregnancy, HRT, oral estrogen) — raises SHBG markedly.
  • Ageing (in men) — SHBG rises, lowering free testosterone even when total looks fine.
  • Anorexia / very low body weight. A high SHBG can mask a low free testosterone behind a normal-looking total.

When to discuss with a doctor

SHBG is rarely the target itself — it is the key to reading testosterone correctly. When a man has symptoms of low testosterone but a borderline-normal total, a high SHBG explains it (free testosterone is genuinely low). In women, a low SHBG in PCOS amplifies androgen effects. Because low SHBG tracks insulin resistance, an unexpectedly low value is worth pairing with fasting glucose and HbA1c. Mediora.AI uses SHBG with your total testosterone to show the free/bioavailable estimate, so a 'normal' total isn't read in isolation; the hormonal or metabolic decision belongs with endocrinology.

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.