DHEA-S: Normal Range by Age, What High and Low Mean

DHEA-S is produced by the zona reticularis of the adrenal cortex, with a small ovarian contribution. It is one of the precursors the body uses to make downstream androgens (testosterone) and, in women, estrogens.

Three properties make DHEA-S a more useful test than DHEA itself:

• Long half-life: ~10 hours vs. minutes for DHEA. Diurnal variation is small. A single afternoon draw is reliable.
• Adrenal-specific: gonads contribute very little. Elevated DHEA-S almost always means adrenal androgen excess.
• Stable across the menstrual cycle: unlike most reproductive hormones.

Because of this, DHEA-S is the standard test in three workups: hyperandrogenism (especially distinguishing adrenal from ovarian sources), suspected adrenal tumor or congenital adrenal hyperplasia, and adrenal insufficiency assessment.

Reference ranges are sharply age-dependent. Approximate values (assays vary):

• Men 20–29: 280–640 µg/dL.
• Men 30–39: 120–520 µg/dL.
• Men 40–49: 95–530 µg/dL.
• Men 50–59: 70–310 µg/dL.
• Men 60+: 40–290 µg/dL.
• Women 20–29: 65–380 µg/dL.
• Women 30–39: 45–270 µg/dL.
• Women 40–49: 32–240 µg/dL.
• Women 50+: 26–200 µg/dL (declines steadily into the 70s).

The age-related decline ("adrenopause") is normal physiology, not disease. Many older adults sit at the lower end of these ranges with no clinical consequence.

Elevated DHEA-S has a focused differential because the adrenal is essentially the only source.

• Polycystic ovary syndrome (PCOS): modestly elevated DHEA-S in 20–30% of women with PCOS. The "adrenal phenotype" subset.
• Congenital adrenal hyperplasia (non-classical): late-onset 21-hydroxylase deficiency. Pair with 17-OH progesterone; ACTH stimulation test confirms.
• Adrenal androgen-secreting tumor: DHEA-S above 700 µg/dL in a woman, or rapidly rising values, warrant urgent adrenal imaging.
• Cushing's syndrome (some forms): adrenal carcinoma can cause both cortisol and androgen excess.
• Premature adrenarche: children with early pubic hair, body odor, and DHEA-S in the early-pubertal range.
• Exogenous DHEA supplementation: one of the most common causes today; ask about supplements before working up "high DHEA-S".

In a woman with hirsutism or irregular cycles, the combination of testosterone, DHEA-S, 17-OH progesterone, and the LH/FSH ratio sorts adrenal vs. ovarian vs. polygenic causes.

Low DHEA-S is far less clinically actionable than high. Common causes:

• Aging: the dominant cause. Expected, not pathologic.
• Adrenal insufficiency (primary, Addison's): DHEA-S is one of the supportive labs; cortisol and ACTH are the primary tests.
• Secondary adrenal insufficiency: pituitary disease.
• Long-term glucocorticoid therapy: chronic prednisone suppresses adrenal androgen production.
• Severe illness, malnutrition, anorexia: global adrenal suppression.
• Some chronic infections (HIV, tuberculosis): affecting adrenal function.

A low DHEA-S without symptoms or other adrenal markers is rarely actionable. It is not a reason to start supplementation in healthy aging adults.

DHEA is sold over the counter in the US (banned in much of Europe). Marketing claims include energy, mood, libido, anti-aging, bone health, cognitive function, and weight loss. The evidence is weaker than the marketing suggests.

• Adrenal insufficiency: there is reasonable evidence that women with documented Addison's disease and persistent fatigue or low libido on cortisol replacement may benefit from low-dose DHEA. This is a specialist decision.
• Aging: randomized trials in healthy older adults show modest, inconsistent effects on body composition and bone density. No effect on cognition or all-cause mortality.
• Diminished ovarian reserve / IVF: small studies suggest DHEA may modestly improve IVF outcomes in women with low AMH. Stronger placebo-controlled data is still needed.
• "Wellness" use: not supported by evidence proportional to the cost or the side effects (acne, hair growth, voice changes, oily skin in women; possible adverse hormonal shifts).

If a patient has a normal DHEA-S, they do not need DHEA supplementation. If they are taking DHEA, their measured DHEA-S becomes uninterpretable for a workup until they stop for at least 4 weeks.

• DHEA-S more than 700 µg/dL in a woman: or rapidly rising values, or accompanied by virilization (deepening voice, clitoromegaly, rapid hair growth), urgent adrenal imaging.
• Hyperandrogenism in a woman: moderately elevated DHEA-S supports adrenal contribution; check 17-OH progesterone for non-classical CAH.
• Hirsutism in a child or premature pubarche: elevated DHEA-S consistent with adrenarche; pediatric endocrinology workup.
• Suspected adrenal insufficiency: low DHEA-S is supportive but not diagnostic; cortisol + ACTH are primary.
• "High DHEA-S, no symptoms": almost always supplementation. Ask before imaging.

• Total testosterone and free testosterone: workup of hyperandrogenism.
• SHBG: interpretation of testosterone in PCOS.
• LH / FSH: ratio elevated in PCOS.
• 17-OH progesterone: distinguishes congenital adrenal hyperplasia.
• Cortisol, ACTH: adrenal function workup.
• Prolactin: included in any reproductive endocrine workup.
• AMH: often elevated in PCOS, low in adrenal-only hyperandrogenism.