What the DHEA-S test shows
DHEA-S (dehydroepiandrosterone sulfate) is the sulfated, storage form of DHEA and the most abundant steroid hormone in the blood. It is a weak “precursor” androgen — raw material the body converts in skin, liver and other tissues into stronger hormones such as testosterone and estrogens. Because almost all of it comes from one place, the adrenal cortex, it is a clean readout of adrenal androgen production, used mainly to find the source of androgen excess in women — acne, unwanted hair, scalp thinning, irregular periods — and to screen for adrenal disorders in both sexes. MedlinePlus notes that DHEAS is “mostly made in the adrenal glands, two small glands located above your kidneys.”
That single source sets it apart from the hormones it is ordered with. Testosterone in women comes from both the ovaries and the adrenals, so a high testosterone does not reveal where the excess starts, whereas a high DHEA-S points to the adrenal gland. And unlike cortisol, which swings through the day, or plain DHEA, released in pulses, DHEA-S stays high and steady with a long half-life, so one random draw is reliable. As StatPearls puts it, “circulating DHEA-sulfate is the best measure of adrenal androgen excess.”
DHEA-S normal range
DHEA-S is reported in micrograms per deciliter (µg/dL); the SI unit is micromoles per litre (µmol/L). The two are not interchangeable — to convert µg/dL to µmol/L, multiply by about 0.0271. Levels peak in young adulthood and fall with age, and men run two to three times higher than women, so results are read against a sex- and age-matched range.
| Group | µg/dL (conventional) | µmol/L (SI) |
|---|---|---|
| Women, 18–29 | ~45–380 | ~1.2–10.3 |
| Women, 30–49 | ~30–270 | ~0.8–7.3 |
| Women, 50+ | ~15–160 | ~0.4–4.3 |
| Men, 18–29 | ~160–640 | ~4.3–17.4 |
| Men, 30–49 | ~90–530 | ~2.4–14.4 |
| Men, 50+ | ~40–330 | ~1.1–8.9 |
| Children / puberty | age- and stage-specific | use your lab’s range |
These bands are orientation only. Assays differ widely between laboratories, and children’s values track puberty (Tanner) stage — so reference ranges depend on the lab, sex and age, and should be read against your own report.
Why DHEA-S is high
A high DHEA-S means the adrenal glands are making extra androgen, and how high it is matters as much as that it is raised. By frequency:
- Polycystic ovary syndrome (PCOS) — the commonest cause of a mildly raised DHEA-S in a woman; StatPearls lists it among the markers checked for hyperandrogenism, though only a minority show a rise.
- Non-classic congenital adrenal hyperplasia (NCCAH) — an inherited enzyme block, most often 21-hydroxylase deficiency, that diverts adrenal steroids into androgens; confirmed with 17-OH-progesterone.
- Premature adrenarche — in children, early adrenal androgen activity brings pubic hair and body odor ahead of schedule.
- Adrenal overactivity, including Cushing’s syndrome, where several adrenal steroids rise together.
- An androgen-secreting adrenal tumor — uncommon, but the reason the test exists: because DHEA-S is almost purely adrenal, a markedly high value is the classic flag for an adrenal adenoma or carcinoma.
When is it urgent? A very high value, or fast-moving virilization — deepening voice, temple balding, muscle gain or clitoral enlargement — points to a tumor and needs prompt imaging and specialist review. The Endocrine Society advises checking DHEA-S mainly when the picture is severe enough to suspect a tumor.
Why DHEA-S is low
A low DHEA-S is far less often acted on, because the usual cause is simply time. By frequency:
- Normal aging — levels peak in the twenties and fall by roughly 2–4% a year (“adrenopause”), so a low value in an older adult is expected, not a disease.
- Adrenal insufficiency (Addison’s disease) or pituitary (ACTH) failure, where DHEA-S falls along with cortisol; it supports the picture but is not the diagnostic test — cortisol and ACTH are.
- Long-term steroid (glucocorticoid) treatment, which suppresses the adrenal drive.
- Chronic illness, and sometimes obesity or type 2 diabetes.
When is it urgent? A low DHEA-S alone is not an emergency, but symptoms of failing adrenal glands — deep fatigue, weight loss, dizziness on standing, salt craving or darkening skin — deserve prompt testing, and an adrenal crisis (vomiting, collapse, very low blood pressure) is a medical emergency.
What to test alongside
DHEA-S is one line in a hormone work-up. Depending on the question, it is read with:
- Testosterone — the main active androgen; adrenal vs ovarian or testicular source.
- Free testosterone — the unbound, active fraction.
- SHBG — the carrier protein that sets how much testosterone is free.
- 17-OH-progesterone — screens for non-classic congenital adrenal hyperplasia.
- Cortisol — adrenal function and Cushing’s syndrome.
- Prolactin — another cause of irregular periods.
- LH and FSH — the LH-to-FSH pattern seen in PCOS.
- Estradiol — the main estrogen.
- TSH — thyroid problems mimic the same menstrual and hair changes.
- Glucose and HbA1c — insulin resistance travels with PCOS.
What to do about an abnormal result
- Don’t self-treat, and don’t start DHEA supplements. Over-the-counter DHEA raises the number being measured and can mask or mimic a medical cause — tell your doctor if you take it.
- Read it in context. A single mildly abnormal value means little; it is read next to your symptoms, age and the rest of the panel.
- For a high DHEA-S: your doctor weighs how high it is and how fast symptoms appeared — mild rises lead to a PCOS or NCCAH work-up, a very high value to adrenal imaging and an endocrinology referral.
- For a low DHEA-S: alone it rarely needs action, but with symptoms of adrenal insufficiency it is followed by cortisol and ACTH testing.
- See your primary-care doctor or gynecologist first; they decide whether an endocrinologist is needed.
Mini-FAQ
What is the difference between DHEA-S and testosterone?
DHEA-S is a weak precursor androgen made almost entirely by the adrenal glands; testosterone is the stronger active androgen made mainly by the ovaries or testes. A high DHEA-S points to an adrenal source of androgen, while a high testosterone more often points to the ovaries or testes.
Why is DHEA-S measured instead of DHEA?
DHEA-S sits at a much higher, steadier level in the blood and barely changes through the day, so a single random sample is reliable. Plain DHEA rises and falls in pulses, which makes it harder to read from one draw.
What does a high DHEA-S usually mean?
Most mild elevations reflect polycystic ovary syndrome or non-classic congenital adrenal hyperplasia. A markedly high DHEA-S, well above the age range, raises concern for an androgen-producing adrenal tumor and needs prompt evaluation.
Does DHEA-S fall with age?
Yes. Levels peak in your twenties and then decline by roughly 2–4% a year, so a low result in an older adult is often just normal aging rather than disease.
Do DHEA supplements affect the test?
Yes. Over-the-counter DHEA supplements raise blood DHEA-S and can mimic a medical cause of high levels, so tell your doctor about any supplements and stop them before testing if advised.
