Dehydroepiandrosterone (DHEA)
A DHEA (Dehydroepiandrosterone) Test measures the level of a specific precursor hormone in your blood.
Think of DHEA as a raw material or building block. Your adrenal glands (the small hats sitting on top of your kidneys) produce most of it. Your body then takes this DHEA and converts it into male sex hormones (androgens like testosterone) and female sex hormones (estrogens).
Because it is primarily made by the adrenal glands, doctors use this test as a clear window into how well your adrenal glands are working.
Parameters Measured
Preparation
DHEA Blood Test: What Your Results Mean
DHEA doesn't do much on its own. Its real job is being a starting material your adrenal glands produce it, and your body then converts it into testosterone and estrogen depending on where it's needed. Because the adrenal glands make most of it, measuring DHEA gives doctors a fairly direct look at how those glands are functioning.
A quirk worth knowing before you test
DHEA behaves differently from many other hormones tested from blood. It rises and falls throughout the day following your circadian rhythm, and it clears from the bloodstream fast, with a half-life of only about 15 to 20 minutes. That's in contrast to its more commonly ordered relative, DHEA-S (the sulfated form), which sticks around for roughly 10 hours and stays far more stable through the day. Because of that difference, DHEA-S tends to be the go-to choice when doctors want a steady, reliable snapshot of adrenal output, while plain DHEA is more often used when the specific question is about the source of excess androgen activity, since it responds more directly to what's happening right now.
If your doctor has specifically ordered DHEA rather than DHEA-S, it's usually because they're chasing that immediate androgen picture rather than a long-term trend, and the timing of your blood draw may matter more than it would for other hormone tests.
Why this test gets ordered
DHEA testing often comes up when investigating symptoms of excess androgen activity irregular periods, acne, or unusual hair growth in women, for example since conditions like polycystic ovary syndrome (PCOS) can involve elevated adrenal androgen production alongside ovarian causes. It's also used when adrenal gland disorders are suspected, including rare adrenal tumors, or as part of a broader hormonal workup when levels seem unexpectedly low or high for someone's age. DHEA production naturally declines with age after early adulthood, so results are generally interpreted with that in mind rather than against a single fixed number for every adult.
No fasting is required, though your doctor may specify a particular time of day for the blood draw given DHEA's natural daily fluctuation.