DHEA-S: When to Order This Test and What Your Results Mean

What DHEA-S Actually Measures

DHEA-S stands for dehydroepiandrosterone sulfate, the sulfated form of DHEA. It is the most abundant circulating steroid hormone in the human body and serves as a precursor that peripheral tissues convert into testosterone and estradiol [1]. The adrenal cortex produces 90-95% of circulating DHEA-S, with small contributions from the ovaries and testes.

Why Test DHEA-S Instead of DHEA

Clinicians prefer DHEA-S over unconjugated DHEA for a practical reason: stability. DHEA fluctuates with diurnal rhythm and has a plasma half-life of only 15-30 minutes. DHEA-S, by contrast, has a half-life of 10-20 hours and shows minimal variation throughout the day [2]. This makes it a far more reliable single-draw marker of adrenal androgen production. A morning blood draw is standard but not strictly necessary.

The Age Curve

DHEA-S follows a predictable lifespan trajectory. Levels rise sharply during adrenarche (ages 6-8), peak between ages 20 and 30, then decline at approximately 2-3% per year [3]. By age 70-80, circulating DHEA-S may be only 10-20% of peak values. This pattern is consistent across sexes, though absolute concentrations run higher in males at every age.

When Clinicians Order a DHEA-S Test

The primary clinical indication is the evaluation of androgen excess in women. The Endocrine Society's 2018 clinical practice guideline on hirsutism explicitly recommends measuring serum DHEA-S alongside total testosterone when evaluating women with unwanted androgen-dependent hair growth [4]. A markedly elevated DHEA-S (above 700 mcg/dL) raises concern for an adrenal androgen-secreting tumor and warrants urgent imaging.

Investigating Hirsutism and Virilization

Women presenting with hirsutism (excess terminal hair in a male-pattern distribution), severe cystic acne, deepening voice, or clitoromegaly should have DHEA-S drawn as part of the initial workup. The goal is to distinguish ovarian sources of androgen excess (where DHEA-S is typically normal) from adrenal sources (where DHEA-S is elevated) [4]. In a study of 873 women with hirsutism, 6.7% had DHEA-S as their sole abnormal androgen marker [5].

Evaluating Suspected PCOS

Polycystic ovary syndrome affects 8-13% of reproductive-age women worldwide, according to the 2023 international evidence-based guideline [6]. While PCOS is primarily an ovarian condition, approximately 20-30% of women with PCOS demonstrate elevated DHEA-S, reflecting adrenal androgen overproduction as a contributing pathway. The guideline recommends DHEA-S testing when clinical hyperandrogenism is present but total testosterone is normal.

Screening for Adrenal Pathology

DHEA-S is a targeted screening tool for two adrenal conditions:

• Congenital adrenal hyperplasia (CAH): Non-classic 21-hydroxylase deficiency, the most common form of late-onset CAH, produces elevated DHEA-S alongside elevated 17-hydroxyprogesterone. The Endocrine Society guideline on CAH recommends confirming diagnosis with an ACTH stimulation test when screening values are borderline [7].
• Adrenal tumors: A DHEA-S concentration exceeding 600-700 mcg/dL in a woman (or a value grossly out of range for age) should prompt adrenal CT imaging. Adrenocortical carcinomas frequently secrete DHEA-S, and a rapid rise in levels over months is an alarm signal [8].

Assessing Adrenal Insufficiency

Low DHEA-S supports the diagnosis of adrenal insufficiency when combined with low morning cortisol and an abnormal ACTH stimulation test. The test alone cannot diagnose adrenal insufficiency, but in patients already on glucocorticoid replacement, a persistently low DHEA-S may indicate that DHEA supplementation warrants discussion [9].

Age-Related Hormonal Decline

Some clinicians order DHEA-S in the context of fatigue, low libido, or general hormonal assessment in adults over 40. While age-related DHEA-S decline is universal, the clinical significance of replacing it remains debated. The 2006 Endocrine Society position statement concluded that evidence did not support DHEA supplementation for age-related decline in otherwise healthy adults, though targeted use in adrenal insufficiency had support [9].

Normal DHEA-S Ranges by Age and Sex

Reference ranges vary between laboratories, but the following age-stratified values represent consensus ranges from major reference laboratories [10].

| Age Group | Female (mcg/dL) | Male (mcg/dL) | |-----------|-----------------|----------------| | 18-29 | 65-380 | 108-441 | | 30-39 | 45-270 | 89-427 | | 40-49 | 32-240 | 56-334 | | 50-59 | 26-200 | 41-285 | | 60-69 | 13-130 | 28-175 | | 70+ | 10-90 | 17-120 |

Interpreting Borderline Results

A single DHEA-S value sitting at the upper or lower boundary of a reference range rarely tells the full clinical story. Context matters. A 28-year-old woman with a DHEA-S of 375 mcg/dL and no symptoms needs no further workup. The same value in a 55-year-old woman with new-onset hirsutism and acne is clearly abnormal relative to age-expected levels and deserves investigation.

Units and Conversion

DHEA-S can be reported in mcg/dL, ng/mL, or micromol/L depending on the laboratory. To convert mcg/dL to micromol/L, multiply by 0.027. Confirm which units your lab uses before comparing results to published ranges.

What High DHEA-S Means

An elevated DHEA-S points toward the adrenal gland as the source of androgen excess. The clinical significance depends on how high the value is and how quickly it rose.

Mildly Elevated (Upper Limit to ~600 mcg/dL)

The most common causes are PCOS with adrenal contribution, non-classic CAH, obesity-related adrenal activation, and chronic stress. In a cross-sectional analysis of 1,987 women evaluated for hyperandrogenism, mildly elevated DHEA-S was attributable to PCOS in 72% of cases [11]. Treatment focuses on the underlying condition. Combined oral contraceptives reduce DHEA-S by suppressing adrenal androgen production through decreased ACTH drive.

Markedly Elevated (above 600-700 mcg/dL)

Values in this range, particularly with rapid onset, warrant adrenal imaging to exclude adrenocortical carcinoma or adrenal adenoma. The American Association of Clinical Endocrinology (AACE) recommends CT of the adrenals as the first imaging step [12]. "A DHEA-S value that rises sharply over weeks to months, rather than being chronically mildly elevated, significantly increases the pretest probability of malignancy," notes the AACE 2023 adrenal incidentaloma guideline [12].

How to Lower High DHEA-S

Lowering DHEA-S depends on the underlying cause:

• PCOS: Combined oral contraceptives, spironolactone (100-200 mg daily), or both. Metformin does not consistently reduce DHEA-S [6].
• Non-classic CAH: Low-dose dexamethasone (0.25-0.5 mg at bedtime) or hydrocortisone suppresses adrenal androgen production [7].
• Adrenal tumor: Surgical resection is definitive.
• Stress-related elevation: Stress management, adequate sleep, and moderate exercise can modestly reduce adrenal androgen output, though evidence for DHEA-S-specific reductions is limited.

What Low DHEA-S Means

Low DHEA-S is common and most often reflects normal aging. By age 70, both men and women typically have DHEA-S concentrations 70-80% below their peak values [3].

Pathological Causes of Low DHEA-S

Beyond aging, low DHEA-S may indicate primary adrenal insufficiency (Addison disease), secondary adrenal insufficiency from pituitary disease, chronic glucocorticoid use (which suppresses the entire adrenal axis), or severe chronic illness. In primary adrenal insufficiency, DHEA-S is often undetectable, and the Endocrine Society's 2016 guideline on adrenal insufficiency suggests considering DHEA replacement (25-50 mg daily) in women with low energy or reduced libido despite optimized cortisol replacement [9].

How to Raise Low DHEA-S

For age-related decline without adrenal disease, the evidence for DHEA supplementation remains mixed. A randomized controlled trial of 225 older adults (the DHEAge study) found that 50 mg daily DHEA for one year raised DHEA-S levels to youthful ranges but produced no significant improvements in cognitive function, body composition, or quality of life compared to placebo [13]. A separate trial by Nair et al. (N=87) published in the New England Journal of Medicine reached similar conclusions: two years of DHEA supplementation in elderly men and women improved DHEA-S levels but did not improve body composition, physical performance, insulin sensitivity, or quality of life [14].

For adrenal insufficiency, the picture is different. "In women with adrenal insufficiency and symptoms of androgen deficiency, a trial of DHEA replacement at 25-50 mg/day is reasonable, with reassessment at 6 months," according to the Endocrine Society's clinical practice guideline [9]. Responders typically report improved energy and libido within 3-6 months.

How to Prepare for a DHEA-S Test

DHEA-S is one of the simpler hormone tests from a preparation standpoint.

No Fasting or Timing Restrictions

Because DHEA-S has minimal diurnal variation, fasting is not required and the test can be drawn at any time of day [2]. This distinguishes it from cortisol or DHEA, both of which require timed morning draws.

Medications That Affect Results

Several drugs can alter DHEA-S concentrations and should be documented when ordering:

• Exogenous DHEA supplements will raise DHEA-S. Patients should stop DHEA supplements at least 2-4 weeks before testing if the goal is to assess endogenous production.
• Oral contraceptives and glucocorticoids suppress DHEA-S and may mask underlying adrenal overproduction.
• Insulin sensitizers like metformin have inconsistent effects on DHEA-S [6].
• Anticonvulsants (particularly valproate) can increase DHEA-S through hepatic enzyme effects.

What to Order Alongside DHEA-S

DHEA-S is rarely ordered in isolation. For androgen excess workups, pair it with total testosterone, free testosterone, sex hormone-binding globulin (SHBG), and 17-hydroxyprogesterone (early-morning draw to screen for CAH) [4]. For adrenal insufficiency, order morning cortisol and an ACTH stimulation test. For a general hormonal panel, clinicians often add a complete metabolic panel, thyroid function tests, and fasting insulin.

DHEA-S in Specific Populations

Women With PCOS

The 2023 international evidence-based guideline for PCOS recommends DHEA-S testing when biochemical hyperandrogenism needs confirmation and testosterone is normal or borderline [6]. Among women with PCOS, those with elevated DHEA-S may have a distinct phenotype: some data suggest they carry a lower metabolic risk profile than women with primarily ovarian androgen excess, though this finding is not consistent across all studies [15].

Men With Suspected Hypogonadism

DHEA-S testing is not a standard part of the male hypogonadism workup. The Endocrine Society's 2018 guideline on testosterone therapy focuses on total testosterone, free testosterone, and LH/FSH [16]. DHEA-S may be ordered as an adjunct when adrenal insufficiency is suspected or when evaluating fatigue in men with normal testosterone levels.

Perimenopause and Postmenopause

DHEA-S declines during the menopausal transition, contributing to the overall androgen milieu shift. Some research has explored whether DHEA-S levels predict menopausal symptom severity, but the Study of Women's Health Across the Nation (SWAN), a longitudinal cohort of 3,302 women, found that DHEA-S was not independently associated with vasomotor symptom frequency after adjusting for estradiol and FSH [17].

Children and Adolescents

Premature adrenarche (early pubic hair, body odor, or acne before age 8 in girls or 9 in boys) is the most common pediatric indication for DHEA-S testing. An elevated DHEA-S confirms adrenal androgen production as the source. Values should be interpreted against pediatric reference ranges, which are substantially lower than adult ranges [18]. Most cases of premature adrenarche are benign, but elevated DHEA-S with rapid progression warrants evaluation for non-classic CAH or adrenal tumors.

Limitations of the DHEA-S Test

DHEA-S is a useful screening tool, not a diagnostic endpoint. It cannot distinguish between PCOS and non-classic CAH on its own. It does not predict symptom severity. And in the context of aging, a low DHEA-S does not automatically warrant supplementation, given the negative results of major supplementation trials [13][14]. Clinicians use DHEA-S as one data point within a broader hormonal and clinical picture. The test answers "Is the adrenal gland making too much or too little androgen?" It does not answer "What should we do about it?" without additional context.

A DHEA-S value <15 mcg/dL in a young adult should always trigger further investigation. A value above 700 mcg/dL in a woman demands adrenal imaging within days, not weeks.