What Is A SHBG Test?
SHBG is a protein produced by the liver that binds to sex hormones, including testosterone and estrogen, and regulates their availability in the body. The test is primarily used to evaluate hormonal imbalances and assess conditions related to reproductive health. SHBG levels can influence the amount of free (active) testosterone and estrogen which play critical roles in sexual development, fertility and overall health. The SHBG test is often ordered alongside other hormone tests such as testosterone or estrogen levels to provide a comprehensive picture of hormonal health. It is commonly used to diagnose conditions like polycystic ovary syndrome (PCOS), hypogonadism or androgen excess in women and low testosterone or infertility in men. The test is also helpful in evaluating liver function and thyroid health as these can affect SHBG production.
How is the Test Performed?
Sample Collection
The test requires a blood sample which is drawn from the arm of the patient.
Lab Analysis
The blood is tested for SHBG levels using immunoassay techniques such as enzyme-linked immunosorbent assay (ELISA) which is a highly accurate method of detecting different hormone levels.
Result
Results are typically available in 3 to 4 days.
What are the symptoms that prompt this test?
SHBG is often warranted when patients suffer from the following symptoms:
Men
- Low libido
- Erectile dysfunction
- Fatigue
- Loss of muscle mass
- Infertility
Women
- Irregular menstrual cycles
- Excessive hair growth (hirsutism)
- Acne
- Weight gain
- Infertility
What are Normal Ranges for This Test?
The normal ranges for SHBG levels vary by age, sex, and laboratory standards. General guidelines are:
- Men 10-57 nmol/L
- Women 18-144 nmol/L (varies with age and hormonal status)
These ranges may differ slightly depending on the lab and testing method used.
** Normal levels are dependent on a number of factors including age, gender, testing method and health condition of patient etc. Result interpretation should be done by a qualified doctor or healthcare professional.**
What Happens if Test Results Show Abnormal Levels?
Abnormal SHBG levels may indicate underlying health conditions that require further investigation.
- If levels are too high it may suggest liver disease, hyperthyroidism or estrogen dominance.
- Low levels may indicate obesity, insulin resistance, hypothyroidism or androgen excess.
Depending on the results your doctor may recommend additional tests such as free and total testosterone levels, estrogen levels, thyroid function tests or liver function tests. Treatment options will vary based on the underlying cause and may include hormone therapy, lifestyle modifications or medications to address specific imbalances.
