DHEA sulfate (DHEAS) is a hormone produced mainly by the adrenal glands that serves as a building block for estrogen and testosterone in women. It circulates in the bloodstream at higher concentrations than almost any other steroid hormone, and your body converts it into active sex hormones as needed throughout life. Because DHEAS levels change dramatically with age and can signal several health conditions, it’s one of the most commonly ordered hormone tests in women.
How DHEAS Is Made and What It Does
Your two adrenal glands, which sit on top of your kidneys, produce most of your DHEAS in a layer called the zona reticularis. Smaller amounts come from the ovaries, liver, fat tissue, and even the brain. The adrenal glands first release DHEA (without the “S”), which then gets converted into its sulfated form, DHEAS, primarily in the liver. This sulfated version is far more abundant in your blood and much more stable, making it the form doctors measure.
DHEAS itself isn’t particularly active. Think of it as a raw material your body stores and ships to tissues that need it. Once DHEAS reaches organs like the ovaries, skin, or brain, enzymes strip off the sulfate group and convert it back into DHEA, then further into estrogen or testosterone depending on the tissue. Before menopause, this pathway supplements the estrogen your ovaries already produce. After menopause, when ovarian estrogen production drops sharply, DHEAS becomes an even more important source of whatever estrogen and testosterone your body still makes.
Beyond its role as a hormone precursor, DHEAS appears to have protective effects on its own. Research links it to anti-inflammatory activity, immune system regulation, and neuroprotective functions in the brain.
How Levels Change With Age
DHEAS follows a distinctive pattern over a woman’s lifetime. Production ramps up during puberty, peaks in the mid-20s, and then declines steadily. By the time a woman reaches her 70s or 80s, her DHEAS levels may be only 10 to 20 percent of what they were at their peak. This gradual decline is normal and happens to everyone, though the rate varies from person to person.
One reason DHEAS is a convenient lab test is that levels stay remarkably stable throughout the day. Unlike cortisol, which spikes in the morning and drops at night, or reproductive hormones that shift across the menstrual cycle, DHEAS doesn’t fluctuate much from hour to hour. You can get the blood draw at any time of day, you don’t need to fast, and you don’t need to time it to a specific day of your cycle.
What High DHEAS Levels Mean
Elevated DHEAS in women points to excess androgen (male-type hormone) production, usually from the adrenal glands. The symptoms can be noticeable and frustrating: excess facial and body hair, acne, thinning hair on the top of the head, irregular or absent periods, a deepening voice, and increased muscle bulk. Not every woman with high DHEAS will experience all of these, but the pattern is driven by the same underlying excess of androgens.
The two most common conditions behind high DHEAS are polycystic ovary syndrome (PCOS) and congenital adrenal hyperplasia (CAH). PCOS is a widespread hormonal disorder in women of reproductive age that involves irregular ovulation and often elevated androgens from both the ovaries and adrenals. CAH is an inherited condition where the adrenal glands overproduce androgens because they lack a specific enzyme needed to make cortisol properly. A milder form, called non-classic CAH, sometimes goes undiagnosed until adulthood when a woman is evaluated for excess hair growth or fertility problems.
In rare cases, very high DHEAS levels can signal an adrenal tumor. These tumors directly produce androgens, and DHEAS levels tend to be dramatically elevated rather than modestly above normal. This is one reason doctors pay attention to how high the number actually is, not just whether it’s above the reference range.
What Low DHEAS Levels Mean
Low DHEAS generally reflects underperforming adrenal glands. The most straightforward cause is adrenal insufficiency, a condition where the adrenals can’t produce enough hormones. Primary adrenal insufficiency (Addison’s disease) occurs when the adrenal glands themselves are damaged, often by an autoimmune attack. Secondary adrenal insufficiency happens when the pituitary gland in the brain stops sending the signals that tell the adrenals to work, sometimes after long-term use of steroid medications like prednisone.
Symptoms of low adrenal function include persistent fatigue, weakness, dizziness, weight loss, low blood pressure, nausea, and muscle aches. Women may also notice irregular or absent periods. In primary adrenal insufficiency, darkening of the skin, particularly around the mouth, nipples, and skin creases, is a distinctive sign.
Age-related decline is a separate and normal reason for low DHEAS. A postmenopausal woman with DHEAS levels lower than a 25-year-old doesn’t necessarily have a problem. The context matters: your doctor interprets DHEAS alongside your age, symptoms, and other lab results.
DHEAS During Pregnancy
Pregnancy lowers DHEAS levels significantly. The placenta actively takes up DHEAS from both the mother and the fetus and converts it into estrogen, which is essential for maintaining the pregnancy. This conversion pulls DHEAS out of the mother’s circulation, so pregnant women consistently have lower levels than non-pregnant women of the same age.
Research published in Acta Endocrinologica found that DHEAS levels may not fully bounce back after pregnancy, and that the decline appears to be somewhat steeper in women who have carried pregnancies compared to those who haven’t. On the other hand, high DHEAS levels before pregnancy have been associated with anovulation and difficulty conceiving, highlighting the hormone’s role in the delicate balance of the reproductive system. Notably, DHEAS is not a reliable indicator of ovarian reserve, so it’s not used to predict how many eggs remain.
How High DHEAS Is Managed
Treatment for elevated DHEAS depends entirely on the underlying cause. In women with PCOS, the goal is typically to manage the symptoms of excess androgens, such as unwanted hair growth and acne, rather than targeting DHEAS directly. Hormonal contraceptives are a common first-line approach because they suppress androgen effects and regulate periods.
For women with classic congenital adrenal hyperplasia, low-dose glucocorticoids can suppress the overactive adrenal androgen production by replacing the cortisol the body can’t make efficiently on its own. In the milder, non-classic form of CAH, glucocorticoids aren’t typically used as first-line treatment for cosmetic symptoms like hirsutism, though they may help women who are trying to conceive.
If an adrenal tumor is responsible, surgical removal is the standard approach.
Lifestyle changes like weight loss can produce a small improvement in androgen levels for women with PCOS who are overweight. Studies show a modest decrease in free testosterone and a mild improvement in excess hair growth with weight loss. However, lifestyle changes alone have a limited impact on hyperandrogenism and shouldn’t be the only strategy when symptoms are significant.
Why Doctors Order the DHEAS Test
A DHEAS blood test is most commonly ordered when a woman shows signs of androgen excess, like new or worsening facial hair, persistent acne that doesn’t respond to typical treatments, or irregular periods. It’s also used when adrenal insufficiency is suspected, or when evaluating delayed or early puberty in girls.
Because DHEAS comes primarily from the adrenal glands while testosterone in women comes from both the adrenals and ovaries, measuring DHEAS helps doctors pinpoint the source of excess androgens. If DHEAS is high but testosterone is normal, the problem is more likely adrenal. If both are elevated, PCOS or another condition involving both sources may be at play.
The test itself is a simple blood draw with no special preparation. Results are reported in micrograms per deciliter, and reference ranges are always stratified by age because of the dramatic natural decline over a woman’s lifetime. A level that’s perfectly normal for a 20-year-old would be unusually high for a 60-year-old.