DHEA-S Test: Normal Range and What a Low or High Result Means

DHEA is produced in the zona reticularis of the adrenal cortex under ACTH control and is then quickly sulfated to DHEA-S. Smaller amounts are made in the testes, ovaries and brain. DHEA itself stays in the blood for a very short time and varies noticeably through the day, whereas DHEA-S is a 'storage' form — it persists in the blood many times longer and is far more stable. That is why laboratories measure DHEA-S rather than DHEA: a single sample better reflects adrenal secretion over a longer period.

DHEA-S is a precursor: peripheral tissues can convert it (via DHEA and androstenedione) into small amounts of testosterone and estradiol. In men, however, most testosterone comes from the testes, so the contribution of adrenal precursors to the total androgen pool is small — unlike in women, in whom DHEA-S is a more important source of androgens. A practical rule follows: in a man, DHEA-S is not a good substitute for measuring testosterone and says nothing about the 'hormonal performance' of the testes.

Because DHEA-S secretion depends on ACTH, its concentration is a sensitive but nonspecific indicator of pituitary stimulation of the adrenals. When ACTH is lacking (pituitary insufficiency, long-term glucocorticoid use), DHEA-S falls. When the adrenals produce androgens in excess on their own (congenital adrenal hyperplasia, tumors), DHEA-S rises. This logic underlies most diagnostic uses.

Converting: 3470 ng/ml is about 347 µg/dl, or about 9.4 µmol/l, and 670 ng/ml is about 67 µg/dl, or about 1.8 µmol/l. Conversion factor: 1 µg/dl equals about 0.027 µmol/l (and 1 µg/dl is 10 ng/ml). Today's laboratories use newer methods (immunoassay or LC-MS/MS) and their reference intervals can differ, so only the ranges printed on your result, in the correct age category, count.

Practical conclusion: a typical 45-year-old man has clearly lower DHEA-S than a 25-year-old, and that is normal physiology. A result 'within the range for age' requires nothing, and a result 'below the range for age' requires context. Variability is also worth remembering: fluctuation of around 20% between successive samples in the same person is normal, so a difference of a few percentage points in a follow-up test is not a change.

The result is also affected by sex, body weight, blood pressure and — in women — hormonal contraception. In a paper describing reference intervals for 16 steroids measured by LC-MS/MS in 525 volunteers (including 68 women on contraception), the authors explicitly point to the influence of sex, age, contraceptive pills, BMI and blood-pressure status on adrenal steroid concentrations. In men, age and obesity matter most.

The most common reason for a result below the 'young adult range' is simply age. When the result is low even for your own age group, several groups of causes are considered.

In diagnosing adrenal insufficiency, DHEA-S plays a supporting role. A 2025 review in JAMA describes using early-morning (about 8 a.m.) measurements of cortisol, ACTH and DHEA-S for diagnosis. Primary insufficiency is characterized by low morning cortisol (< 5 µg/dl), high ACTH and low DHEA-S, and secondary and glucocorticoid-induced insufficiency by low or intermediate cortisol (5–10 µg/dl) and low or low-normal ACTH and DHEA-S. For intermediate results the test is repeated or an ACTH (cosyntropin) stimulation test is done. The key point is that DHEA-S does not make the diagnosis on its own: cortisol and functional tests are decisive.

There is also a phenomenon not to be forgotten: 'low DHEA-S' after years of steroid use (e.g., in asthma or rheumatic disease) can be the only early clue that the adrenal axis is suppressed. Always tell the doctor interpreting the result about all the drugs you take — including drops, ointments and inhalers.

High DHEA-S in a young man is very often normal — peak values around age 20 are the highest of a lifetime. Before a result is considered abnormal it must be related to the age group. When it truly exceeds the upper limit for age, several possibilities are considered.

The Endocrine Society guideline on congenital adrenal hyperplasia due to 21-hydroxylase deficiency (Speiser et al., 2018) describes the classic and non-classic forms and how they are assessed; in the non-classic form the key marker is 17-hydroxyprogesterone, while DHEA-S is sometimes raised as part of a broader picture of adrenal androgens. DHEA-S alone is not used for diagnosis — 17-OHP (often with a stimulation test) and genetic testing decide.

This result should not be read as 'low DHEA-S shortens life'. It is an observational study: even after statistical adjustment for known risk factors, the possibility remains that low DHEA-S is merely a marker of poorer general health (chronic disease, inflammation, insulin resistance, drugs) rather than its cause. Only interventional studies can answer whether raising DHEA-S changes anything.

DHEA-S is stable through the day, so it does not require the discipline of cortisol or testosterone, but a few rules make interpretation easier. If the test is part of an adrenal assessment, it is drawn together with cortisol and ACTH in the morning — typically around 8 a.m. For seasonal or follow-up assessment, the time you usually have blood drawn is enough, as long as you are consistent.

A similar myth is treating DHEA-S as a 'biological age marker' to be kept at young-adult levels. Observational data show an association of low DHEA-S with a worse prognosis in older men, but they do not prove causality, and interventions have not confirmed benefit. In practice, better indicators of health remain blood pressure, glycemia, lipid panel, muscle mass and fitness, on which we have real tools of influence.

DHEA-S is an example of a test that has good uses in narrow, clearly defined situations (suspected adrenal insufficiency, adrenal androgen excess) but, as part of a 'preventive hormone panel', generates more anxiety than information. If you want to do it, do it with the question: what will the result change in a decision? If the answer is 'nothing', it is usually enough to check testosterone, glycemia, lipids and thyroid and to take care of sleep and training.