SHBG (Sex Hormone-Binding Globulin): what your level actually means
Also known as: Sex Hormone-Binding Globulin · Updated 19 Aug 2026 · Educational — not medical advice
The short answer: SHBG typically ranges from about 20 to 130 nmol/L in adults, though normal levels differ between men and women and shift with age and hormone status. This protein binds tightly to testosterone and estrogen in the bloodstream, so its level directly determines how much of those hormones remain 'free' and biologically active, which is why SHBG is usually interpreted together with total testosterone rather than by itself.
Where does your value sit?
This SHBG (Sex Hormone-Binding Globulin) value is inside the normal range. Your lab's printed reference range takes precedence — ranges vary slightly between laboratories.
What SHBG tells you
SHBG is a protein made by the liver that binds tightly to sex hormones like testosterone and estrogen, keeping them inactive while bound. Only the small unbound fraction is free to act on tissues, so a change in SHBG can shift how much active hormone is available even if the total hormone level stays exactly the same, which is why the two tests are read together. (Illustration is schematic.)
Common reasons it rises
- Hyperthyroidism — an overactive thyroid commonly raises SHBG levels.
- Liver disease in some forms — certain liver conditions and estrogen-related changes can raise SHBG.
- Aging in men — SHBG tends to rise gradually with age, which is part of why free testosterone tends to fall more than total testosterone in older men.
- Certain medicines — some anti-seizure drugs and hormonal treatments can raise SHBG.
And reasons it runs low
- Obesity and insulin resistance — both are strongly associated with lower SHBG levels.
- Hypothyroidism — an underactive thyroid tends to lower SHBG.
- Polycystic ovary syndrome — commonly associated with lower SHBG in women, contributing to higher free androgen levels.
- Certain liver conditions and some medicines, including some steroids — can also reduce SHBG.
What should I eat?
Eat freely
- Vegetables, whole grains, and dal — A steady, low-glycaemic pattern supports insulin sensitivity
- Fibre-rich foods like beans and oats — Fibre helps improve insulin sensitivity over time
- Fish, chicken, eggs, if you eat them — Protein supports weight management without extra sugar
- Nuts and seeds in small portions — Healthy fats support a balanced, insulin-friendly diet
Go easy on
- Refined carbs like maida and white rice — Digest fast and work against insulin sensitivity
- Large portion sizes at meals — Excess calories work against weight-related SHBG changes
Best avoided
- Sugary drinks as a daily habit — A major driver of insulin resistance over time
- Deep-fried snacks and bakery items regularly — Contribute to weight gain and insulin resistance
Can I exercise?
Stop and get help if
- Chest pain, pressure, or breathlessness during activity
- Dizziness or fainting
Regular activity and gradual weight loss are the changes most likely to raise a low SHBG over time.
Your week
- 5 days: a 30-minute brisk walk, cycle, or swim
- 2 days: light strength training with body weight
- Daily: general movement and reduced sitting
- 1 to 2 rest days
Start here: A 15-minute brisk walk, building up gradually
Skip for now
- Sudden intense workouts after a long inactive period
Check with your doctor first: Anyone trying to conceive, with polycystic ovary syndrome, or with thyroid disease should discuss SHBG-related diet and weight changes with their doctor rather than making changes alone.
General guidance for adults — not a personal diet plan. Your doctor or dietitian knows your full picture.
Checked against: MedlinePlus: Polycystic Ovary Syndrome · Mayo Clinic: PCOS
What to do next
Ask your doctor: “Given this SHBG level, is my free testosterone likely different from what my total testosterone alone suggests?”
Ask your doctor: “Could my thyroid function or weight be affecting this result?”
Ask your doctor: “Should free or bioavailable testosterone be calculated or directly measured given this result?”
Read together with
Questions people ask
Why does SHBG matter if my total testosterone is normal?
Because SHBG determines how much of that total testosterone is actually free to act on the body's tissues. Two people with identical total testosterone can have very different amounts of active hormone if their SHBG levels differ, which is why doctors often calculate or measure free testosterone alongside SHBG.
Can weight loss change my SHBG level?
Yes, since obesity and insulin resistance are both linked to lower SHBG, meaningful weight loss and improved insulin sensitivity can raise SHBG over time. This shift can, in turn, change how much free testosterone or estrogen is available even without a change in the total hormone level.
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