DHEAS (dehydroepiandrosterone sulfate) is a steroid hormone produced mainly by the adrenal glands, the small organs that sit on top of your kidneys. It’s the most abundant steroid hormone circulating in your blood, and it serves as a building block your body uses to make testosterone and estrogen. DHEAS levels peak in your 20s and decline steadily with age, dropping to roughly one-third of their peak by your 60s.
How DHEAS Works in Your Body
Your adrenal glands produce the bulk of DHEAS, specifically in a layer called the zona reticularis. Smaller amounts are made in the ovaries, testes, liver, fat tissue, and brain. Because it’s also produced in the brain, DHEAS qualifies as a “neurosteroid,” meaning it can directly influence nervous system function.
DHEAS itself isn’t especially potent. Its real value is as a raw material. Your body converts it into more active hormones in tissues throughout the body. In women, all estrogens and roughly half of androgens (male-type hormones) are synthesized from this pathway. The conversion happens through a chain of enzyme reactions: DHEAS is first converted back to DHEA, then into intermediate hormones, and finally into testosterone or estradiol depending on which enzymes are present in a given tissue. In ovarian tissue, for example, the conversion favors estrogen production, while adrenal tissue tends to favor androgen production.
Beyond its role as a hormone precursor, DHEAS has neuroprotective, anti-inflammatory, and immune-modulating effects. It helps protect against oxidative stress and supports the growth of nerve cell connections.
DHEA vs. DHEAS: Why the “S” Matters
DHEA and DHEAS are essentially the same molecule, except DHEAS has a sulfate group attached. Your body freely converts one into the other. The practical difference is stability. DHEA is cleared from the blood rapidly, with a half-life of just 1 to 3 hours, and its levels swing throughout the day in a pattern similar to cortisol, peaking in the early morning. DHEAS, by contrast, has a half-life of 10 to 20 hours and circulates at concentrations 250 to 500 times higher than DHEA. It doesn’t fluctuate much during the day.
This stability is why doctors measure DHEAS rather than DHEA when they order a blood test. A single blood draw gives a reliable snapshot of your adrenal androgen production regardless of what time you had it done.
Normal DHEAS Levels by Age
DHEAS concentrations are higher in men than in women across all age groups. Both sexes reach peak levels in their 20s, then experience a steady, significant decline with each decade. Typical reference ranges for women, measured in micrograms per deciliter (µg/dL):
- Ages 18 to 29: 45 to 320 µg/dL
- Ages 30 to 39: 40 to 325 µg/dL
- Ages 40 to 49: 25 to 220 µg/dL
- Ages 50 to 59: 15 to 170 µg/dL
- Ages 60 and older: less than 145 µg/dL
Men follow a similar pattern of decline but start from higher baseline levels. By age 60 to 69, average DHEAS levels in both sexes drop to about a third of what they were at peak. This age-related decline is one of the most consistent hormonal changes in human aging.
What High DHEAS Levels Mean
Elevated DHEAS in women often points to excess androgen production, either from the adrenal glands, the ovaries, or both. The most common associated condition is polycystic ovary syndrome (PCOS). About a third of young women with PCOS have DHEAS levels above 300 µg/dL (or 3 mcg/mL, the clinical threshold for elevated). In these cases, adrenal hyperandrogenism typically accompanies ovarian androgen excess rather than replacing it.
Symptoms of high DHEAS in women and girls include:
- Excess facial and body hair growth (hirsutism)
- Severe acne
- Hair thinning at the top of the head
- Irregular or missed periods
- Deepening of the voice
- Increased muscle development
- Infertility
Other causes of elevated DHEAS include congenital adrenal hyperplasia, a genetic condition where the adrenal glands overproduce androgens, and, more rarely, adrenal tumors. Doctors typically check a related hormone called 17-hydroxyprogesterone to rule out congenital adrenal hyperplasia when DHEAS comes back high. Men with elevated DHEAS often have no noticeable symptoms, since their bodies already operate at higher androgen levels.
What Low DHEAS Levels Mean
Low DHEAS can result from problems with the adrenal glands themselves or with the pituitary gland, which sends signals telling the adrenals how much hormone to produce. Addison’s disease, where the immune system attacks the adrenal glands, is a classic cause. In developed countries, autoimmune damage accounts for 8 or 9 out of every 10 cases. Infections like tuberculosis and HIV can also damage the adrenals, though this is less common today.
Secondary adrenal insufficiency, where the problem originates in the pituitary gland, can be caused by pituitary tumors, autoimmune disease, traumatic brain injury, or long-term use of corticosteroid medications that suppress the body’s own hormone production.
Symptoms of adrenal-related low DHEAS include chronic fatigue, muscle weakness, unexplained weight loss, nausea, dizziness (especially when standing up), salt cravings, and low blood sugar. People with Addison’s disease may also notice darkening of their skin. When low DHEAS is simply part of normal aging rather than a disease, the most common complaints are decreased sex drive, erectile dysfunction in men, and vaginal dryness in women.
When and Why a DHEAS Test Is Ordered
A DHEAS blood test is used to evaluate how well your adrenal glands are functioning. Doctors commonly order it when investigating:
- Unexplained masculine features in women or girls, such as facial hair or voice changes
- Severe or treatment-resistant acne
- Irregular periods or infertility
- Suspected adrenal tumors
- Early puberty in boys
- Ambiguous genitalia in newborn girls
- Symptoms of adrenal insufficiency like chronic fatigue and weight loss
The test requires a simple blood draw with no special preparation. Because DHEAS levels don’t fluctuate much during the day, timing doesn’t matter the way it does for cortisol or DHEA testing. Results are usually interpreted alongside other hormone levels, including testosterone, to build a complete picture of androgen production and identify whether excess androgens are coming from the adrenal glands, the ovaries or testes, or both.