What it measures
- SHBG (sex hormone binding globulin)
Who it’s for
- Symptoms of low testosterone with a normal total testosterone
- Interpreting a borderline testosterone result
- Women with signs of excess androgens
Why SHBG changes the picture
Only testosterone that isn’t bound to SHBG is active. If your SHBG is high, which is more common with age, an overactive thyroid, liver problems or very low body fat, you can have symptoms of low testosterone even when your total testosterone looks normal. Low SHBG is common with excess weight, insulin resistance and type 2 diabetes.
For women too
In women, low SHBG means more free testosterone, which can contribute to acne, excess hair and irregular periods. SHBG is also part of our Free Androgen Index and PCOS tests.
How to prepare
- Morning appointments are best if you’re testing alongside testosterone.
- Stop biotin (vitamin B7) supplements, often found in hair, skin and nail products, 48 hours before.
- No fasting needed. Eat and drink as normal.
How it works at our Croydon clinic
Book online
Choose your test and a time that suits you. No GP referral needed.
A 15-minute visit
A trained clinician takes a small blood sample at 169 Shirley Road, Croydon. Tell us if you’re nervous.
Results in 1–3 days
A clear report showing each result against its reference range.
Next steps
Share your report with your GP, who can arrange NHS follow-up if anything needs it.
Questions
Do I need a testosterone test too?
SHBG is most useful alongside a testosterone result. If you haven’t had one recently, book both at the same visit.
Do I need to fast?
No fasting is needed.
How much is a SHBG Test in Croydon?
£79 at our clinic at 169 Shirley Road, Croydon, including taking your blood sample and your report.
How quickly will I get my results?
Usually within 1 to 3 days, in a clear report showing each result against its reference range.