High SHBG in Women: Causes, Symptoms and What to Do
A high SHBG result means your liver is releasing more sex hormone binding globulin than usual. That protein carries hormones around the blood in an inactive form, so a high level can leave you with less free testosterone than your total result suggests. It is a clue, not a diagnosis. The useful question is why it is high, and that depends on your medicines, thyroid, liver, weight, age and symptoms.
TL;DR
- SHBG is made in the liver and binds testosterone, oestradiol and DHT, so a high level can mean less active hormone is available.
- Common triggers include pregnancy, oestrogen (HRT or the pill), an overactive thyroid, liver disease and anorexia.
- Symptoms such as low libido, low mood, fatigue and vaginal dryness overlap with many other conditions, so they cannot confirm high SHBG.
- SHBG is not something you try to change directly. The aim is to find and address the underlying cause with your GP.
- A personalised nutrition and lifestyle review can support the wider picture once medical causes are checked.
Table of Contents
- What SHBG does and what “high” means
- Symptoms of high SHBG in women
- What can cause high SHBG
- How high SHBG is tested and interpreted
- High SHBG with low free testosterone: is it a problem?
- When to see your GP
- Our perspective
- How we can help
- FAQ
- Sources
What SHBG does and what “high” means
SHBG is a protein made by the liver. It holds tightly onto testosterone, oestradiol and DHT and carries them in the blood in an inactive form. Only the hormone that is not bound can act on your tissues.
That is why a high SHBG matters. When it is raised, there is likely to be less free testosterone than the total testosterone indicates. A woman can have a total testosterone that looks fine while the usable fraction is low.
One NHS laboratory lists a reference range of 19 to 145 nmol/L for women under 50 and 14 to 136 nmol/L for women over 50. Ranges differ between laboratories, so always read your result against the range printed on your own report.
Symptoms of high SHBG in women
There is no symptom unique to high SHBG. The ones most often described are:
- low libido or reduced sexual function
- vaginal dryness
- low mood, anxiety or irritability
- fatigue
- irregular or absent periods
- reduced muscle and bone mass
These are listed by women’s health providers, who also stress that the same symptoms appear with low oestrogen or low testosterone. In practice, you cannot tell high SHBG from the symptoms alone. A blood test, read with the rest of your picture, is what tells the story.
What can cause high SHBG
The usual causes are well recognised. Increased SHBG can be seen in anorexia, pregnancy, hyperthyroidism, liver disease and with oestrogens. Oestrogen includes HRT and oral contraceptives.
| Cause | What happens |
|---|---|
| Pregnancy | Higher oestrogen drives SHBG up, which limits free testosterone |
| HRT or the pill | Oestrogen raises SHBG production in the liver |
| Overactive thyroid | Thyroid hormone stimulates SHBG production |
| Liver disease | Changes in how the liver makes proteins |
| Anorexia or very low intake | SHBG rises with under-nutrition |
PCOS is the reverse case. SHBG may be reduced in PCOS, which is why a woman with irregular periods and acne can have a low result rather than a high one.
How high SHBG is tested and interpreted
SHBG is rarely read on its own. When doctors investigate excess androgens, it is often measured with total testosterone to calculate the free androgen index (FAI). The FAI is total testosterone divided by SHBG, multiplied by 100.
Calculated free testosterone agrees better with the gold-standard method than FAI does, and the 2025 Society for Endocrinology guideline advises reading results against age-specific and menopausal-status-specific ranges. For missed periods lasting six months or more, primary care work-up includes FSH, LH, oestradiol, prolactin, thyroid tests, testosterone, SHBG and FAI.
Hormone results also shift with age. Age-related hormone patterns such as AMH decline show why a number only makes sense against the right age group.
High SHBG with low free testosterone: is it a problem?
Not always. A moderately raised SHBG can be a normal finding in some women, and doctors read it alongside your history and symptoms. It matters most when it comes with symptoms and a low free testosterone, or when it points to something underneath, such as a thyroid problem.
The practical point is that there is no reason to change SHBG directly. If a result worries you, book a GP appointment so the whole picture can be considered.
When to see your GP
See a GP if you have thick, dark hair on the face, neck, chest, tummy, lower back, buttocks or thighs. The NHS advises an urgent appointment if it starts suddenly, your voice lowers or your muscles get bigger. NICE guidance also calls for urgent specialist referral in those situations. Missed periods, new low mood or marked fatigue are also worth raising, since a thyroid or liver cause needs a medical answer first.
Bone health matters if oestrogen is low around menopause, and advice on menopause bone loss is worth reading alongside your GP’s guidance.
Our perspective
Most women who come to us with a hormone result in hand have already been told it is “fine” or “borderline”. They still feel exhausted, flat or out of sync.
We do not try to treat a single number. We look at the whole person: digestion, sleep, stress, blood sugar, how regularly and how well you eat, your medicines and your life. A result like high SHBG becomes useful when it is placed in that context, alongside the tests your GP has already arranged.
Our programmes are built around continuous support rather than one appointment, because lasting change comes from habits that fit your day. Our approach is designed to help you build them without added stress, with the guidance of practitioners holding an MSc in Nutrition and BANT and CNHC registration.
Irina
How we can help
If you have a high SHBG result and want a clear, personalised plan for food and lifestyle, our consultations are built for that. Your initial consultation lasts an hour and a half and costs £150, and includes written personalised recommendations. A follow-up within eight weeks is £120, later follow-ups are £80, and 12 weeks of dedicated support is £250.
We also offer laboratory test analysis and interpretation, so your results are explained in the context of your symptoms. See our services for the full range.
FAQ
Is high SHBG a problem?
Not necessarily. It becomes relevant when it reduces free hormones enough to cause symptoms, or when it reflects a cause such as thyroid or liver problems. Your GP will read it with your history and other results.
How can I lower my SHBG as a woman?
SHBG is not changed directly, and there is no reason to do so. The focus is on the cause, for example a thyroid condition or the effect of oestrogen medicines, which your doctor can review. Never stop HRT or the pill without medical advice.
What are the symptoms of high SHBG in females?
Low libido, vaginal dryness, low mood, fatigue and irregular periods are the ones most often reported. They overlap with many other conditions, so testing is needed to know the cause.
What if SHBG is high but free testosterone is low?
It means less testosterone is available to your tissues than the total figure suggests. Ask your GP to interpret it with your age, menopausal status and symptoms.
Sources
- Sex Hormone Binding Globulin (SHBG), Gloucestershire Hospitals NHS
- Sex Hormone Binding Globulin (SHBG), Lab Tests Online UK
- What Do Your SHBG Levels Mean?, Hertility Health
- Gestational hyperandrogenism, UpToDate
- Hyperandrogenism, PCDS
- Society for Endocrinology clinical practice guideline
- Amenorrhoea, Right Decisions
- Excessive hair growth (hirsutism), NHS
- Hirsutism, NICE CKS
- AMH levels by age
- Menopause bone loss