DHEA-Sulfate (DHEA-S) Blood Test
A DHEA-sulfate test measures an adrenal hormone that serves as a building block for other sex hormones. Because it comes almost entirely from the adrenal glands, it is a useful marker of adrenal androgen production and a relatively stable one to sample.
What the test measures
DHEA-sulfate (DHEA-S) is the sulfated form of dehydroepiandrosterone, a hormone produced mainly by the outer layer of the adrenal glands. DHEA and DHEA-S act as precursors, meaning the body can convert them into more potent androgens such as testosterone and, in turn, into estrogens. They sit early in the steroid pathway, so they are sometimes described as a reservoir from which the body draws other hormones as needed.
Two features make DHEA-S convenient to measure. First, it circulates at far higher concentrations than DHEA itself and is more stable in the blood. Second, it does not swing much through the day, unlike cortisol, which rises and falls on a strong daily rhythm. Because the adrenal glands are essentially its only meaningful source, DHEA-S is treated as a window onto adrenal androgen output specifically, separate from androgens that the ovaries or testes contribute.
How DHEA-S fits into the steroid picture
Androgen activity in the body reflects contributions from several organs. The adrenal glands, the gonads, and peripheral tissues that convert precursors into active hormones all play a part. Measuring DHEA-S helps a clinician estimate how much of a person's androgen signal is coming from the adrenal side of that system, which can change how a broader evaluation proceeds.
Why a clinician might order it
DHEA-S is frequently checked when evaluating signs of androgen excess, such as increased facial or body hair, persistent acne, scalp hair thinning, or irregular periods, particularly when the goal is to distinguish an adrenal source from an ovarian one. It may also be ordered when investigating early or unusual patterns of puberty, or when an adrenal condition is being considered. In many evaluations it is measured together with testosterone so that the pattern of the two results, rather than either alone, guides the next step.
It is worth emphasising that the test is part of a workup rather than a standalone screen. A clinician orders it to answer a specific question, most often "where might these androgens be coming from?", and interprets it in the light of symptoms, examination findings, and other laboratory values.
How to prepare
DHEA-S generally does not require fasting, and because it is relatively stable through the day, the exact timing of the draw is usually less critical than it is for cortisol. The sample is a routine blood draw from a vein in the arm and takes only a few minutes. Some supplements and medications can shift levels, so it helps to bring an up-to-date list of everything you take, including over-the-counter products. DHEA is also widely sold as a dietary supplement, and taking it can raise the measured value and blur interpretation.
What can affect results
Several factors influence DHEA-S independently of any underlying disorder, and recognising them helps avoid over-reading a single value:
- Age. DHEA-S tends to be higher in younger adults and declines gradually over the decades, so ranges are age-adjusted.
- Sex. Typical values differ between men and women, and reference intervals are reported separately.
- Supplements and medications. DHEA supplements can raise levels; some hormonal medications and steroids can lower them.
- Acute illness or significant stress. These can temporarily alter adrenal hormone output.
How results are generally interpreted
DHEA-S is read alongside other androgens and the overall clinical picture rather than against a fixed cutoff.
- High DHEA-S points toward the adrenal glands as a source of androgen activity and may prompt further adrenal evaluation, especially when the elevation is marked.
- Low DHEA-S can occur with reduced adrenal function and also tends to appear naturally with advancing age.
- Normal DHEA-S with high testosterone may suggest the excess androgen is arising somewhere other than the adrenal glands, such as the ovaries.
Because no single result is diagnostic on its own, clinicians often repeat or supplement the test, or follow trends over time, before drawing conclusions.
Illustrative reference ranges
The values below are illustrative only and vary widely by laboratory, assay, age, and sex. DHEA-S generally declines with age, so always use the age- and sex-specific range printed on your own report.
| Group | Illustrative DHEA-S | Notes |
|---|---|---|
| Younger adults | higher, often in the hundreds (mcg/dL) | Tends to peak in early adulthood |
| Middle adulthood | moderate | Gradual decline with age |
| Older adults | tends to be lower | Age-adjusted ranges apply |
| Units note | some labs report mcmol/L | Ranges differ by age and sex |
What happens during the test
A DHEA-S test is a standard venous blood draw. A member of the team cleans the skin, applies a tourniquet, and collects a small tube of blood, usually from the inside of the elbow. The process is brief, and most people feel only a quick pinch. Afterward you can return to normal activities. Mild bruising at the site is common and resolves on its own. Because DHEA-S is stable through the day, there is usually no need to schedule the draw at a particular hour, which makes it convenient to combine with other tests in the same visit.
DHEA-S versus DHEA
DHEA and DHEA-S are closely related, but they behave differently in the blood. DHEA circulates at lower concentrations and fluctuates more, while DHEA-S is present at much higher levels and changes little from hour to hour. For evaluating adrenal androgen output, the steadier DHEA-S is usually the more practical measurement, which is why it is the form most often requested. Understanding this distinction helps explain why a report may show DHEA-S rather than DHEA itself.
Related tests
DHEA-S is often interpreted with SHBG, which shapes how much of any androgen is freely available, and it may be considered alongside reproductive markers such as AMH and progesterone when irregular cycles are part of the picture. Browse the blood tests index, the hormones pages, or explore related conditions.
Frequently asked questions
What does DHEA-S tell us that testosterone does not?
Because it comes mainly from the adrenal glands, DHEA-S helps indicate whether excess androgens may be adrenal in origin rather than coming from the ovaries or testes.
Does DHEA-S change through the day?
It is relatively stable, so the specific timing of the draw is usually less critical than it is for cortisol, which follows a strong daily rhythm.
Can supplements affect the result?
Yes. DHEA is sold as a supplement and can raise measured levels, so it is important to mention any such products before testing.
Why does DHEA-S fall with age?
Adrenal production of DHEA-S tends to decline gradually over the years, which is why reference ranges are adjusted for age.
Do I need to fast before a DHEA-S test?
Fasting is generally not required. Follow whatever instructions accompany your test order, and bring a current list of supplements and medications.
Is one DHEA-S result enough to make a diagnosis?
Usually not. It is interpreted alongside other androgens, symptoms, and examination findings, and may be repeated or followed over time.
Sources
- MedlinePlus. Lab Tests. https://medlineplus.gov/lab-tests/
- MedlinePlus. Polycystic Ovary Syndrome. https://medlineplus.gov/polycysticovarysyndrome.html
- Endocrine Society. https://www.endocrine.org/