Hormone Test
DHEA-S Test
A comprehensive guide to the DHEA-S test: how this adrenal androgen is measured, what elevated or low levels indicate for fertility, and how it differs from testosterone as a diagnostic marker.
Test Overview
DHEA-S (dehydroepiandrosterone sulfate) is the sulfated, storage form of DHEA and the most abundant circulating steroid hormone in the human body. It is produced almost exclusively by the adrenal cortex and is measured in fertility evaluations to investigate androgen excess and differentiate adrenal from ovarian sources of elevated androgens.
Key Timing
A morning fasting blood sample. DHEA-S does not fluctuate significantly across the menstrual cycle or throughout the day, making timing less restrictive than most other fertility hormones.
1. Purpose and uses of the DHEA-S test
In women
- Investigate symptoms of androgen excess: hirsutism (excess facial or body hair), acne, scalp hair thinning, and irregular cycles.
- Differentiate PCOS (primarily ovarian androgen source) from Congenital Adrenal Hyperplasia (CAH), which is an adrenal source.
- Screen for androgen-secreting adrenal tumors when testosterone is very high and ovarian causes have been ruled out.
- Monitor women on DHEA supplementation in IVF poor-responder protocols.
In men
- Evaluate adrenal androgen production when standard testosterone testing does not explain infertility or symptom patterns.
- Assess cases of suspected adrenal pathology contributing to reproductive hormone disruption.
- Note: DHEA-S is not a first-line male fertility test. FSH, LH, and testosterone are ordered first.
2. Procedure and preparation
DHEA-S is measured through a standard fasting blood draw. The stability of DHEA-S throughout the day makes morning collection a preference rather than a strict requirement, though most labs recommend sampling before 10:00 AM.
Medications to disclose before testing: corticosteroids suppress adrenal androgen output and can produce falsely low DHEA-S results. Insulin sensitizers, metformin, and some antiandrogen medications may also influence levels. Inform your physician of all medications and supplements before the test.
3. How DHEA-S works
DHEA-S is produced by the zona reticularis of the adrenal cortex. The sulfate group attached to the molecule extends its half-life in circulation, acting as a reservoir. When the body requires additional androgen or estrogen in peripheral tissues, an enzyme called steroid sulfatase cleaves the sulfate group, releasing active DHEA.
DHEA is then converted locally in tissues including the ovaries, fat cells, and skin into testosterone or estradiol, depending on which enzymes are present. This peripheral conversion is why elevated adrenal androgen production can affect ovarian function without the ovaries themselves overproducing hormones.
Age-related decline: adrenopause
DHEA-S peaks in the mid-20s and declines by roughly 10% per decade throughout adulthood. This process is referred to as adrenopause. By age 70 to 80, DHEA-S levels are typically 10 to 20% of peak values. The decline is independent of menopause and is not driven by reproductive hormone changes.
4. Normal reference ranges by age
DHEA-S declines steadily with age. Reference ranges therefore shift significantly across decades. Always interpret against the age-adjusted range from the specific laboratory used.
| Age group | Women (mcg/dL) | Men (mcg/dL) | Trend |
|---|---|---|---|
| 18 to 29 | 44 to 332 | 89 to 457 | Peak decade |
| 30 to 39 | 31 to 228 | 67 to 375 | Gradual decline |
| 40 to 49 | 19 to 205 | 34 to 295 | Continuing decline |
| 50 to 59 | 12 to 154 | 22 to 255 | Accelerating decline |
| 60 to 69 | 10 to 126 | 18 to 203 | Low range |
5. Interpreting results
High DHEA-S
A mildly elevated DHEA-S is seen in approximately 20 to 30% of women with PCOS, but the elevation is typically less pronounced than in adrenal conditions. When DHEA-S is markedly high, the source is almost certainly adrenal rather than ovarian.
- Non-classic Congenital Adrenal Hyperplasia (NCAH): The most important diagnosis to exclude in women with elevated DHEA-S and androgen symptoms. NCAH mimics PCOS clinically but requires different management. A 17-hydroxyprogesterone (17-OHP) test, ideally drawn on Day 3, is used to confirm or rule it out.
- Adrenal tumor: A DHEA-S above 700 to 800 mcg/dL in an adult should prompt imaging to rule out an androgen-secreting adrenal adenoma or carcinoma.
- Cushing's syndrome: Excess cortisol production can be accompanied by adrenal androgen excess. Additional cortisol testing distinguishes this diagnosis.
Low DHEA-S
- Corticosteroid use: Chronic corticosteroid therapy is the most common cause of suppressed DHEA-S in otherwise healthy individuals.
- Adrenal insufficiency: Low DHEA-S alongside low cortisol and symptoms of fatigue and weight loss may indicate Addison's disease.
- Normal aging: Below-range DHEA-S in older adults without symptoms is not typically treated.
6. DHEA-S vs. testosterone: reading the pattern
When androgen excess is confirmed, measuring both DHEA-S and total testosterone together helps locate the source. This matters because treatment differs significantly depending on whether androgens are coming from the adrenal glands or the ovaries.
| Pattern | Most likely source | Next step |
|---|---|---|
| High DHEA-S, normal testosterone | Adrenal (CAH, adrenal tumor) | 17-OHP test; adrenal imaging if DHEA-S very high |
| High testosterone, normal DHEA-S | Ovarian (PCOS, ovarian tumor) | Pelvic ultrasound; LH/FSH ratio |
| Both mildly elevated | Mixed; typical PCOS pattern | Full PCOS workup; insulin and glucose testing |
| Both markedly elevated | Adrenal pathology or CAH | Endocrinology referral; 17-OHP; cortisol |