SHBG (Sex Hormone-Binding Globulin): Reference Ranges & What It Reveals About Your Hormones
QA OK grounded/no-fab/schema/no-dup - SHBG controls how much testosterone and estrogen is available to your body. Learn normal ranges and what high or low means.
In This Guide
If you have had a testosterone or estrogen result that did not seem to match how you feel, sex hormone-binding globulin (SHBG) may be part of the answer. SHBG is a protein your liver mostly makes. It binds tightly to your sex hormones, testosterone, dihydrotestosterone, and estradiol, and decides how much of them your body can actually use. Measuring SHBG helps you read a testosterone or estrogen result in context instead of on its own.
What SHBG does
Hormone that is bound to SHBG is held in reserve. Your tissues cannot readily use it. The higher your SHBG, the less free, usable hormone you have at any given total level, and the lower your SHBG, the more. That is why SHBG is needed to calculate free and bioavailable testosterone.
Reference ranges
Typical adult reference ranges are about 10-57 nmol/L for men and 18-144 nmol/L for women. These ranges shift with age and differ between laboratories, so read your value against the range printed on your own report.
What high SHBG can indicate
- Aging (SHBG tends to rise over time)
- Hyperthyroidism (an overactive thyroid)
- Liver disease
- Higher estrogen levels
- Caloric restriction or low body weight
High SHBG can leave your free testosterone low even when your total testosterone looks normal. That can lead to low-testosterone symptoms despite a total result that seems reassuring.
What low SHBG can indicate
- Insulin resistance and type 2 diabetes
- Obesity and metabolic syndrome
- Hypothyroidism (an underactive thyroid)
Low SHBG is a recognized marker tied to metabolic dysfunction, so an unexpectedly low value can be a useful reason to take a closer look at your metabolic health.
Who should consider testing
SHBG is most useful when you measure it alongside total testosterone, especially when your symptoms and your total testosterone level do not match, or when you are evaluating metabolic health. It is a standard part of a thorough hormone panel.
What optimization looks like
SHBG is not treated directly. It is interpreted in context. Working on the underlying factors, your thyroid status, insulin sensitivity, body composition, and liver health, is what tends to move SHBG in a healthier direction. Your clinician uses SHBG together with your other hormone and metabolic markers to guide the next steps.
Educational only, not medical advice. Reference ranges are assay-dependent; consult a licensed clinician to interpret your results.
Take the ENNU Life health assessment to see how your hormone and metabolic markers fit together.
Medically Reviewed
Content reviewed by EnnuLife's medical team to ensure accuracy and adherence to current clinical guidelines.
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