DHEA-S test: what does high or low DHEA sulfate mean?

The DHEA-S test (dehydroepiandrosterone sulfate) measures the blood level of DHEA-S, the sulfated form of DHEA — the most abundant adrenal hormone produced by the adrenal glands. DHEA-S serves as a precursor that the body can convert into sex hormones such as testosterone and estrogen, and it is considered one of the most reliable markers of adrenal function.

A DHEA sulfate blood test is commonly ordered when symptoms of high DHEA-S are investigated — such as excess body hair (hirsutism), severe acne, or irregular periods in women — or when low DHEA-S symptoms like chronic fatigue and muscle weakness are evaluated. It plays a critical role in diagnosing conditions such as polycystic ovary syndrome (PCOS), congenital adrenal hyperplasia (CAH), and adrenal tumors.

DHEA-S levels decline naturally with age, a process known as adrenopause. Peak values typically occur in the 20s, followed by a steady decrease of roughly 10–20 % per decade. For this reason the DHEA-S normal range must always be interpreted in the context of age and sex.

The DHEA-S normal range varies considerably by age and sex. The table below summarises the commonly accepted reference values for adults. Results are typically reported in micrograms per decilitre (µg/dL); some laboratories use µmol/L (1 µg/dL ≈ 0.027 µmol/L).

The following table shows male and female DHEA sulfate levels by age group:

DHEA sulfate levels reach their highest point between the ages of 20 and 30 and then decline by approximately 10–20 % per decade. By age 70+ values may fall to roughly 20–30 % of their peak. Always compare your result with the age- and sex-specific reference range on your own laboratory report.

High DHEA-S or low DHEA-S can point to a variety of clinical conditions. Interpretation should always be combined with clinical findings. The main causes include:

Causes of high DHEA-S:

• Polycystic ovary syndrome (PCOS): The most common cause of elevated DHEA-S in women, PCOS leads to hyperandrogenism, irregular periods, and polycystic ovaries.
• Congenital adrenal hyperplasia (CAH): Genetic defects in adrenal steroid-synthesis enzymes cause overproduction of DHEA-S.
• Adrenal tumors: Adrenal adenomas or carcinomas can markedly elevate DHEA-S; very high values are a red flag for malignancy.
• Cushing syndrome: ACTH-dependent forms may drive excess adrenal androgen production.

Causes of low DHEA-S:

• Adrenal insufficiency (Addison disease): Inadequate hormone production by the adrenal glands leads to low DHEA-S.
• Hypopituitarism: Reduced ACTH output from the pituitary suppresses adrenal function and lowers DHEA-S.
• Adrenopause (age-related decline): DHEA-S production physiologically decreases as part of normal ageing.
• Long-term corticosteroid use: Exogenous steroids suppress the hypothalamic-pituitary-adrenal axis and can lower DHEA-S.

For diagnosis, DHEA-S is evaluated alongside other adrenal hormone test results (cortisol, ACTH, 17-OH progesterone) and imaging when needed. A single DHEA-S result alone is not diagnostic.

If you are a woman experiencing excess facial or body hair, severe acne, hair loss, irregular periods, or infertility, consult an endocrinologist or gynaecologist and request a DHEA-S test. These symptoms may indicate PCOS or adrenal-origin hyperandrogenism.

Chronic fatigue, muscle weakness, weight loss, dizziness, or low blood pressure may signal low DHEA-S and possible adrenal insufficiency. If you also notice skin darkening, seek medical evaluation promptly because untreated Addison disease can be life-threatening.

Remember: DHEA-S results should not be evaluated in isolation. They must be considered together with the clinical picture, other hormone tests, and imaging as needed. If your results fall outside the normal range share them with a specialist — do not attempt self-treatment based on internet research alone.