Estradiol vs DHEA-S: Key Differences Explained
Estradiol is an active estrogen mostly made by the ovaries. DHEA-S is an adrenal precursor the body can turn into estrogen and testosterone. Learn how they differ and how to read them together.
- Published
- April 23, 2026
- Last updated
- September 25, 2026
- Read time
- 4 min read
- Medically reviewed by
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Rhonda Collins, FNP-C
Estradiol and DHEA-S sit at different points on the same production line. DHEA-S (dehydroepiandrosterone sulfate) is made mostly by the adrenal glands and acts as a building block that tissues can convert into testosterone and estrogen. Estradiol is an active estrogen, made mainly by the ovaries before menopause. An estradiol result tells you about ovarian hormone output, while DHEA-S tells you about adrenal output, which is why the two are sometimes ordered together.
What Is Estradiol?
Estradiol (E2) is the main estrogen in women of childbearing age who are not pregnant. In women it is made mainly by the ovaries, and it rises and falls across the menstrual cycle. Men make smaller amounts, largely from testosterone. Results are usually reported in picograms per milliliter (pg/mL).
What Is DHEA-S?
DHEA-S is the sulfated, circulating form of DHEA, a hormone made mostly in the adrenal glands. It plays an important role in making testosterone and estrogen. A DHEA-S test is used to check how the adrenal glands are working, to look for adrenal tumors, to find the cause of early or late puberty, and to look into excess facial or body hair in women.
How Estradiol and DHEA-S Are Connected
DHEA-S is upstream of estradiol. Tissues can convert DHEA into androgens such as testosterone, and those androgens can be converted into estrogens, including estradiol.
How much this pathway matters depends on life stage:
- Before menopause: most of a woman’s estradiol comes directly from the ovaries, so DHEA-S is a minor contributor to the estradiol result.
- After menopause: the ovaries stop releasing estrogen, and adrenal DHEA becomes a main source of the sex steroids made locally in tissues. Estrone, made mostly in body fat and the adrenal glands, becomes the main circulating estrogen.
- With age: DHEA secretion begins to fall around age 30 and is, on average, about 60% lower by the time of menopause, with wide variation between people.
Estradiol vs DHEA-S at a Glance
Feature | Estradiol | DHEA-S |
|---|---|---|
What it is | An active estrogen, the main one before menopause. | A precursor hormone with weak activity of its own, stored in the blood in sulfated form. |
Made by | Mainly the ovaries in women. Men make smaller amounts, largely from testosterone. | Mostly the adrenal glands. |
Main job | Supports the menstrual cycle, reproductive tissues, and bone. | Supplies building blocks that tissues convert into testosterone and estrogen. |
Changes with age | Falls around menopause, when the ovaries stop releasing estradiol. | Declines gradually through adulthood, starting around age 30. |
Changes across the menstrual cycle | Yes, rises and falls through the cycle. | Not a cycle hormone, so it reflects adrenal output more than cycle timing. |
Common reasons to test | Cycle changes, fertility, menopause questions, estrogen balance in men. | Adrenal function, excess facial or body hair, early or late puberty. |
Usual units | pg/mL | µg/dL |
Reading Estradiol and DHEA-S Together
- High DHEA-S with signs of excess androgen: a high DHEA-S can point to congenital adrenal hyperplasia, an adrenal tumor, or polyendocrine metabolic ovarian syndrome (PMOS, formerly PCOS). In this setting estradiol is read to understand the rest of the hormone picture, not as the main finding.
- Low DHEA-S: low values can reflect an adrenal gland disorder or, more often, normal aging.
- After menopause: a low estradiol is expected, and DHEA-S describes a separate, adrenal source of sex steroid building blocks.
Estradiol and DHEA-S use different units and different reference ranges, and neither can be converted into the other. For how an estradiol value is read against cycle phase and life stage, see how to read estradiol levels by age and life stage.
FAQs
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Does DHEA-S change across the menstrual cycle like estradiol? It is not a cycle hormone. It reflects adrenal output, so the cycle day matters much less than it does for estradiol.
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Is DHEA-S an estrogen? No. It is a precursor with weak activity of its own. The body can convert it into testosterone and estrogen.
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Why would a woman’s DHEA-S be tested? Most often to look into excess facial or body hair, acne, irregular periods, or other signs of high androgens, or to check adrenal function.
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Can men have DHEA-S tested? Yes. It is often done along with testosterone tests in men.
References
- MedlinePlus: DHEA sulfate test
- MedlinePlus: Estrogen levels test
- Labrie. DHEA, important source of sex steroids in men and even more in women. Prog Brain Res, 2010
Related Guides
Men’s hormone tests
DHEA-Sulfate (DHEA-S) Blood Test
The main marker of adrenal androgen production, central to working up androgen excess.
Testosterone, Free and Total Blood Test
A complete view of testosterone: total levels plus the free portion available for your body to use.
Sex Hormone-Binding Globulin (SHBG) Blood Test
The transport protein that decides how much of your testosterone and estradiol is actually available to tissues.
Measure the main estrogen of the reproductive years with a standalone blood test.
