DHEAS Blood Test (Dehydroepiandrosterone Sulphate)

• Check how well your adrenal glands are producing androgens across adulthood and healthy ageing.
• Help investigate symptoms of excess androgens in women, such as excess facial or body hair, acne, scalp hair thinning, or menstrual changes.
• Support diagnosis of adrenal driven causes of high testosterone, including some adrenal tumors and congenital adrenal hyperplasia.
• Provide context for low libido, low energy, and reduced vitality when interpreted alongside other sex hormones.
• Help differentiate between adrenal and ovarian or testicular sources of androgen excess.
• Track DHEAS levels over time in preventative health programs focused on hormonal ageing and metabolic resilience.

DHEAS stands for dehydroepiandrosterone sulphate. It is a sulphated form of DHEA and is produced mainly by the adrenal cortex, with smaller contributions from ovaries and testes. Once in circulation, DHEAS serves as a relatively stable reservoir that can be converted back to DHEA and then into more potent androgens and oestrogens in tissues.

Because DHEAS levels are high in early adult life and gradually decline with age, they are often used as a broad marker of adrenal androgen output and hormonal ageing. Unlike many hormones, DHEAS shows minimal day to day fluctuation and little diurnal variation, which makes single blood measurements easier to interpret.

DHEAS itself has relatively weak direct androgenic effects, but its main role is as a precursor. Local tissues convert DHEAS and DHEA into active androgens and oestrogens, which then influence libido, skin and hair, body composition, and other aspects of metabolic and reproductive health.

Beyond sex hormone biology, research suggests that DHEAS may modulate immune function, mood, and stress responses, although the exact mechanisms and clinical implications are still being explored. In practical terms, DHEAS is a useful window into how much androgen substrate your adrenal glands are supplying to the rest of your body.

Because DHEAS feeds into downstream androgen and oestrogen production, abnormal levels can signal that androgen balance is off. High DHEAS can drive or contribute to features of androgen excess, particularly in women, such as hirsutism, acne, and menstrual disturbance, and can point toward adrenal rather than ovarian sources.

Low DHEAS can occur with adrenal insufficiency, some pituitary disorders, and in more advanced age, and is sometimes associated with reduced vitality, lower libido, and changes in bone and metabolic health. Understanding your DHEAS level helps connect adrenal function with how you feel, perform, and age, especially when combined with cortisol and other sex hormone markers.

It is easy to assume DHEAS and testosterone measure the same thing, but they provide complementary information.

• DHEAS is an adrenal derived androgen precursor that reflects upstream adrenal androgen production and is relatively stable through the day.
• Testosterone is a more potent androgen, produced mainly in the testes in men and in smaller amounts by ovaries and adrenals in women, and can fluctuate more across the day and menstrual cycle.

This distinction matters because raised DHEAS with normal ovarian hormones suggests an adrenal source of androgen excess, whereas raised testosterone with normal DHEAS may point toward ovarian or testicular causes. Looking at both together, along with SHBG and other hormones, helps pinpoint where androgen disruption is coming from.

DHEAS reflects how your adrenal glands are producing androgen precursors over time. These are the main things that influence that number.

1. Age and sex

DHEAS levels are highest in late adolescence and early adulthood, then gradually decline with age in both men and women. Typical reference ranges are sex specific and age specific, so a result that is high for a woman in her 30s may be low for a man in his 20s. This age related pattern is one reason DHEAS is sometimes discussed in the context of hormonal ageing.

2. Adrenal gland health

Because DHEAS is produced mainly in the adrenal cortex, any condition that affects adrenal function can change levels. Adrenal tumors, congenital adrenal hyperplasia, and some forms of Cushing's syndrome can raise DHEAS, while adrenal insufficiency, Addison's disease, or significant adrenal damage can lower it.

3. Pituitary and hypothalamic control

The pituitary gland influences adrenal androgen production through ACTH. Pituitary disorders that alter ACTH output can therefore affect DHEAS levels, sometimes in parallel with cortisol changes. When both DHEAS and cortisol are abnormal, clinicians often look upstream at pituitary and hypothalamic health.

4. Polycystic ovary syndrome and androgen excess in women

In women with androgen excess, such as those with polycystic ovary syndrome, DHEAS can be normal, mildly raised, or significantly raised depending on the balance between adrenal and ovarian contributions. A disproportionately high DHEAS compared with testosterone can suggest a stronger adrenal component to the androgen pattern.

5. Medications and supplements

Some medications, including exogenous DHEA supplements, hormone therapies, and certain anticonvulsants, can raise or lower DHEAS levels. Because over the counter DHEA is available in some settings, it is important to mention any supplements to your clinician before testing to avoid misleading results.

6. Chronic illness and lifestyle factors

Chronic illness, severe stress, and some systemic conditions can influence adrenal androgen production alongside other hormones. Body weight, metabolic health, smoking, and alcohol intake may also modulate DHEAS levels over time, although the relationships are complex and often indirect.

Normal DHEAS ranges vary between laboratories, are usually sex specific and age specific, and are often reported in micromoles per litre. In adult practice, many UK laboratories use ranges that broadly resemble:

• Younger adults: higher ranges, often in the low to mid double digit micromole per litre range.
• Midlife adults: moderate ranges that decline gradually compared with younger adults.
• Older adults: lower ranges that reflect age related decline in adrenal androgen production.

Your lab report will show the exact reference range for your age and sex. Results just outside the range are not automatically a problem, but they can provide useful context when combined with symptoms, examination findings, and other hormone tests.

A DHEAS level inside the laboratory reference interval is usually described as normal, but this does not fully capture what might be optimal for you. For example, a value at the upper end of the range in a woman with acne and excess facial hair may still support a diagnosis of androgen excess, while a low normal value in a person with signs of adrenal insufficiency may raise concern.

In preventative health, DHEAS is most useful when you track it over time and interpret it within a network of other hormones, including cortisol, testosterone, oestradiol, and metabolic markers. The goal is not simply to be normal on paper, but to understand how adrenal androgen output aligns with how you feel, function, and age.

You do not usually need to fast for a DHEAS blood test. Unlike cortisol, DHEAS levels are relatively stable throughout the day, so timing is less critical and tests can often be performed at any convenient time unless your clinician advises otherwise.

If your DHEAS test is being run alongside other blood tests that do require fasting, such as glucose or some lipid measurements, you will be given specific preparation instructions. Using the same preparation each time you test helps ensure that changes you see in your DHEAS level reflect real biology rather than short term variation.

Supporting healthy DHEAS levels focuses on understanding why they are high or low and addressing those drivers. Depending on your situation, clinician guided approaches may include:

• Investigating for adrenal tumors, congenital adrenal hyperplasia, or Cushing's syndrome when DHEAS is markedly raised, particularly with signs of androgen excess.
• Assessing for adrenal insufficiency, pituitary disorders, or advanced adrenal damage when DHEAS is very low, especially alongside low cortisol or other hormone changes.
• Managing polycystic ovary syndrome and other androgen excess conditions with personalised lifestyle strategies, targeted medications, and cycle aware care.
• Reviewing hormone therapies, DHEA supplements, and other medications that may be elevating or suppressing DHEAS and adjusting them where appropriate.
• Tracking DHEAS over time as part of a wider hormonal ageing and metabolic resilience plan, rather than treating a single number in isolation.

Any decision to use DHEA supplements or specific hormone modifying treatments should always be made with a qualified clinician, as over or under correction can create new hormone imbalances.