Lab marker · Low

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

A Sex hormone-binding globulin (SHBG) result below the normal range is considered low. Here is what a reduced 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 low Sex hormone-binding globulin (SHBG) can mean

  • Insulin resistance, type 2 diabetes, metabolic syndrome — the classic driver; low SHBG is an early metabolic flag.
  • Obesity — strongly lowers SHBG.
  • PCOS — low SHBG raises free androgens, worsening acne and hirsutism.
  • Hypothyroidism.
  • Androgen or steroid use, acromegaly.

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.