The cortisol:DHEA-S ratio (both in µg/dL) compares the main stress hormone with its counterweight, computed automatically when both are measured.
A high ratio means cortisol outweighs DHEA-S, a pattern of long-running stress load that tends to accompany poorer sleep, recovery and body composition.
Optimal Cortisol:DHEA-S Ratio: 0-0.09 ratio.
Typically re-tested every 12 weeks.
Because the number is a comparison rather than a measurement, it is only meaningful when both hormones were measured in the same sample, at the same lab, in the same reporting units.
The cortisol:DHEA-S ratio is a calculated value that expresses your cortisol concentration relative to your DHEA-sulfate concentration, used as an index of the balance between catabolic stress signalling and adrenal androgen output.
Both hormones come from the adrenal cortex and both answer to the same upstream signal. Adrenocorticotropic hormone released by the pituitary drives the adrenal cortex, and a dose-response study in healthy adults found that adrenocorticotropin stimulated cortisol, aldosterone and dehydroepiandrosterone secretion together 1. That shared control is exactly why the ratio is interesting. If one branch of the adrenal response moves while the other does not, the single values can each look unremarkable while the balance between them shifts.
Cortisol is the short-acting arm. It rises sharply after waking, falls across the day, and climbs again under acute demand. DHEA-S is the long-acting arm. It is the sulfated, circulating reservoir form of DHEA, it has a far longer half-life than cortisol, and it moves slowly, which makes it a steadier background reading. Research tracking both steroids around waking found distinct diurnal patterns for cortisol and DHEA in relation to the awakening response 2, so the hour of your blood draw matters more for the cortisol half of the fraction than for the DHEA-S half.
The two hormones also follow different life-stage curves. Work on salivary cortisol and DHEA across puberty reported that the two steroids relate differently to pubertal stage and to sex 3, and DHEA-S tends to peak in early adulthood and drift down with age while cortisol does not fall in the same way. Over decades, that divergence alone pushes the ratio upward.
Related: Is DHEA Sulfate the Same as Testosterone? (Key Differences)
It matters because the two hormones pull in broadly opposite directions, so their balance tracks something neither value captures alone.
Cortisol mobilises fuel, suppresses non-urgent repair, and keeps you functional through acute demand. DHEA and DHEA-S act as precursors to downstream sex steroids and are generally described as the counter-regulatory, anabolic side of adrenal output. A review of DHEA(S) and cortisol in aging concluded that the shifting balance between them is relevant to immune function in older adults 4, which is one of the clearest reasons the ratio is studied rather than either hormone in isolation.
A review in the psychiatric literature proposed that cortisol and dehydroepiandrosterone each play a role in human development and psychopathology, with their relative levels carrying information that single measurements miss 5. In adolescents facing a real academic examination, the salivary cortisol to DHEA ratio responded to the acute stressor and was associated with performance 6. In an experimental setting, studies indicate that cortisol and DHEA-S are associated with startle potentiation during aversive conditioning in humans 7, which suggests the pair influence how strongly the nervous system reacts to threat cues.
None of that makes the ratio a diagnostic test. It is a screening-level signal about load and reserve. Read as part of a wider picture, a drifting ratio can be an early prompt to look at sleep, training volume, recovery and thyroid and sex hormone markers before symptoms become harder to untangle.
FitScript's optimal range for the cortisol:DHEA-S ratio is 0 to 0.09.
| Measure | FitScript optimal range |
|---|---|
| Cortisol:DHEA-S ratio | 0 to 0.09 |
Reference ranges vary by lab, age and sex, and the ratio is particularly sensitive to how each hormone is reported, so compare a result only against the range printed on that specific report. FitScript's optimal range is an optimization target, not a diagnostic cut-off, and sitting outside it does not establish that anything is wrong.
Two practical points about reading the table. First, there is no meaningful lower bound in the standard range, so a very low number is interpreted by looking at the two underlying hormones rather than the fraction. Second, because DHEA-S falls with age in most people, an identical ratio means something different at 25 than at 65, which is why a single result is far less informative than a trend across repeat testing.
A high cortisol:DHEA-S ratio means cortisol is elevated relative to DHEA-S, which may reflect a period of sustained physiological or psychological load, declining adrenal androgen output, or both at once.
People who turn up with a high ratio often describe a recognisable cluster. Waking unrefreshed, an energy dip in the afternoon, a second wind late at night, slower recovery between hard training sessions, a shorter fuse, cravings for salt or sugar, and a stubborn change in how weight sits around the middle. These are reported patterns, not criteria, and every one of them has explanations that have nothing to do with adrenal steroids.
Common contributors include prolonged work or caregiving stress, chronic short sleep, high training volume with inadequate recovery, acute illness, and ordinary aging. The sharpest illustration comes from critical illness, where a study of intensive care unit patients described cortisol concentrations rising while dehydroepiandrosterone and DHEA-sulfate concentrations fell 8, separating the two arms of adrenal output in opposite directions at the same time.
Over the long term, a persistently high ratio is best treated as a question rather than an answer. Research on aging suggests the cortisol to DHEA(S) balance is relevant to immune function 4, and a suboptimal ratio is a reasonable prompt to review sleep, recovery, thyroid markers and sex hormones with a clinician. If a high ratio comes with symptoms such as unexplained weight change, muscle weakness, new high blood pressure, easy bruising or marked mood change, that combination is worth discussing with a clinician promptly rather than tracking on your own.
A low cortisol:DHEA-S ratio means cortisol is low relative to DHEA-S, which can arise either because cortisol output is genuinely low or because DHEA-S is running high for that person's age and sex.
Symptoms, when present, are non-specific. Some people report low morning energy, light-headedness on standing, poor tolerance of intense exercise, salt craving or low mood. Many people with a low ratio report nothing at all, particularly younger adults whose DHEA-S naturally sits near the top of the range.
Causes worth considering include a blood draw taken late in the day when cortisol has fallen, a naturally high adrenal androgen output, supplement use, and conditions in which adrenal androgens are elevated. Supplementation is a real and often overlooked cause. A systematic review and meta-analysis of randomised trials examined the effects of DHEA supplementation on cortisol and related markers 9, so anyone taking DHEA should tell the ordering clinician before the ratio is interpreted. Whether supplementation is appropriate for a given person is a decision for a licensed provider, not something to start from a lab number.
The long-term significance of a low ratio depends almost entirely on which hormone is driving it. A low result from genuinely low cortisol is a different conversation from a low result driven by high DHEA-S, and only looking at the two component values side by side separates them. Do not ignore a low result because it sits inside a reference range, and do not read it as a diagnosis either.
Quite a lot, and most of it is modifiable or avoidable on test day.
Timing. Cortisol swings across the day while DHEA-S barely moves, and research on the awakening response documented the distinct diurnal patterns of the two adrenal steroids 2. An early morning draw and a late afternoon draw can produce very different ratios from the same person on the same day, which is why repeat testing should happen at a consistent hour.
Acute stress before the draw. A rushed commute, a difficult phone call or needle anxiety can lift cortisol in minutes. In adolescents sitting an examination, the salivary cortisol to DHEA ratio shifted in response to that acute academic stressor 6.
Illness and recovery. Acute severe illness separates the two hormones markedly, as described in intensive care patients 8. Testing during or shortly after a significant illness gives a snapshot of that episode rather than your usual baseline.
Sample type and collection quality. Serum and salivary measurements are not interchangeable, and saliva has its own pitfalls. One study found that bacteria in the oral mucosa can affect the measurement of cortisol, dehydroepiandrosterone and testosterone in saliva 10, which is why collection instructions about eating, drinking and oral hygiene before a saliva sample exist.
Exercise. A systematic review and meta-analysis in older adults reported that physical activity influences cortisol and dehydroepiandrosterone (sulfate) levels 11. A very hard session the day before a draw is a plausible reason for an unexpected result.
Stress-reduction practices. A randomised controlled trial in healthy university students examined the effect of laughter yoga on salivary cortisol and dehydroepiandrosterone 12, and early evidence suggests that low-cost behavioural practices can shift these steroids. That is an encouraging signal, not a promise of a specific result.
Age, sex and pubertal stage. Cortisol and DHEA relate differently to puberty and to sex 3, and DHEA-S trends down with age in most adults.
Medications and supplements. Several prescription medicines and over-the-counter supplements can raise or suppress these hormones or interfere with the assay. List everything you take for the clinician ordering or reviewing the test, including anything taken only occasionally.
FitScript does not currently test the cortisol:DHEA-S ratio in a panel.
If you already have a result from another lab, you can upload your existing labs and Atlas, FitScript's AI health advisor, will read the ratio alongside your other markers rather than in isolation, which is the only way the number carries useful meaning. Atlas writes your FitScript from your own biology, flagging where a result sits relative to typical lab ranges and where a pattern across several markers deserves a closer look.
For members, the surrounding context comes from broad testing rather than one-off checks, with 150+ biomarkers tested per year, so a value can be read as a trend instead of a single snapshot. Where a result raises a question that might call for prescription treatment, a licensed provider reviews the member and decides whether anything is appropriate. Nothing on this page, and no output from Atlas, replaces that evaluation.
Always look at the two component hormones first, then the downstream steroids they influence.
Cortisol is the numerator and the reason timing matters so much. Without it you cannot tell whether a high ratio is driven by rising cortisol or by falling adrenal androgen.
DHEA-S is the denominator and the slower-moving half of the pair. It is also the value most affected by age and by supplement use.
Testosterone Total matters because DHEA-S feeds the pathways that produce androgens, so a shifting ratio and a shifting testosterone result often appear together.
Testosterone Free describes the fraction available to tissues, which can move independently of the total.
SHBG governs how much sex hormone is bound and unavailable, and it responds to the same metabolic and stress inputs that move cortisol.
IGF-1 sits on the growth and repair side of the ledger and is useful for seeing whether the anabolic signals in general are keeping pace with the catabolic ones.
The cortisol:DHEA-S ratio is a balance measure, not a verdict. FitScript's optimal range is 0 to 0.09, and a result outside it should be read next to the two underlying hormones, your age, your symptoms and the conditions of the draw. A high number often points toward sustained load or age-related decline in adrenal androgens, a low number usually needs the component values to make sense of it, and both deserve a second test under consistent conditions before any conclusion is drawn. This page is educational and is not medical advice. Discuss your results and any treatment decision with a clinician or licensed provider who can see your full history.
For related reading on what drives the cortisol half of this fraction, see FitScript's explainers on cortisol and weight gain and on cortisol triggering foods.
It compares your cortisol result with your DHEA-S result from the same sample. Cortisol is the fast-moving stress hormone and DHEA-S is the slower, steadier adrenal androgen reservoir, so the ratio describes the balance between them rather than the level of either one.
FitScript's optimal range is 0 to 0.09. Ranges vary by lab, age and sex, and the units each hormone is reported in change the arithmetic, so always read a result against the range printed on that report.
No. A high ratio only tells you that cortisol is elevated relative to DHEA-S on the day of the draw. It is a screening-level signal, not a diagnosis, and interpreting it requires the two component values, your age, your symptoms and a clinician's review.
Early morning is the usual choice because cortisol is highest after waking and falls across the day. The more important rule is consistency. Draw repeat tests at the same hour, under similar sleep and training conditions, so the trend means something.
Only a little. A single ratio reflects that morning, that week and whatever was happening in your life beforehand. A second test under comparable conditions, read alongside cortisol, DHEA-S and sex hormone markers, is far more informative than one number.
It can, because supplementing raises the denominator of the fraction and can lower the ratio. Tell the clinician ordering or reviewing the test about any supplement you take, including occasional use. Whether a supplement is appropriate for you is a decision for a licensed provider.
Not currently as part of a panel. If you already have a result from another lab, you can upload your labs and Atlas, FitScript's AI health advisor, will read it alongside your other markers in your FitScript.
Bring the full report, including the individual cortisol and DHEA-S values and the collection time, to a clinician who can see your history. If the result comes with symptoms such as unexplained weight change, marked weakness, new high blood pressure or significant mood change, discuss it with a clinician promptly.