What does a high DHEA-S mean?

DHEA-S, dehydroepiandrosterone sulfate, is a weak androgen made almost exclusively by the adrenal cortex. Because the ovary contributes very little, DHEA-S is used to ask where androgen excess is coming from rather than how severe it is. It is a weak hormone in its own right; most of its effect comes from conversion to testosterone in peripheral tissue. Levels fall steadily with age, so a result must be read against an age-specific reference range.

When it should be measured at all

The 2023 International Evidence-based Guideline is conservative here. It recommends total and free testosterone as the primary assessment of biochemical hyperandrogenism, and says that if testosterone or free testosterone is not elevated, clinicians could consider measuring androstenedione and DHEA-S, while noting these have limited additional value in diagnosing PCOS. Ordering DHEA-S routinely on every woman with acne produces results that are hard to act on.

What a mild elevation usually means

A modestly raised DHEA-S in a woman who otherwise fits PCOS usually reflects an adrenal contribution to the same syndrome and does not change treatment. The combined oral contraceptive pill and spironolactone work on the downstream androgen effect regardless of source. What a mild elevation does not mean is adrenal fatigue, which is not a recognised diagnosis, or a need for adrenal supplements. It also does not require imaging on its own.

The two things worth excluding

Nonclassic congenital adrenal hyperplasia is the alternative diagnosis that matters, and it is screened with an early morning 17-hydroxyprogesterone taken in the follicular phase, with an ACTH stimulation test if the screening value is borderline or raised. The Endocrine Society hirsutism guideline suggests this screening in hyperandrogenaemic women, and even in women with normal androgens where ancestry or family history raises the prior probability. The second concern is an androgen-producing adrenal tumour, suggested by a markedly high DHEA-S together with rapid onset symptoms or virilisation, which prompts adrenal imaging.

If a DHEA-S has come back high, bring the report with its reference range, and note whether your symptoms developed over years or over months. Those two pieces of information decide whether the next step is reassurance, a 17-hydroxyprogesterone, or imaging.