Cortisol Biomarker Testing
It shows how much cortisol you make relative to DHEA-S to gauge stress balance and adrenal adaptation, with easy ordering through Vitals Vault + Quest.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Your Cortisol:DHEA-S ratio is a calculated marker that compares two adrenal-related hormones: cortisol (your main stress hormone) and DHEA-S (a more “protective” androgen precursor that tends to decline with age).
Because it is a ratio, it is less about one single number and more about balance. A higher ratio often means cortisol is dominating relative to DHEA-S, which can fit with chronic stress patterns, poor recovery, and disrupted sleep.
This ratio does not diagnose an “adrenal” condition by itself. It is most useful when you interpret it alongside your symptoms, your medication and lifestyle context, and the actual cortisol and DHEA-S results used to calculate it.
Do I need a Cortisol:DHEA-S Ratio test?
You may consider checking the Cortisol:DHEA-S ratio if you feel like your stress response is “stuck on,” especially when symptoms do not match what you see on basic labs. People often look at this ratio when they have fatigue with poor stress tolerance, sleep disruption, anxiety or low mood, or when they gain weight around the abdomen despite stable habits.
This ratio can also be useful if you are training hard but recovering poorly, getting frequent illnesses, or noticing decreased libido and reduced resilience. In those situations, the balance between catabolic signaling (cortisol) and anabolic/protective signaling (DHEA-S) can add context that a single hormone value may miss.
Testing is also reasonable if you are monitoring a plan that could affect these hormones, such as changes in sleep schedule, workload, exercise volume, or clinician-directed hormone therapy. Your result should support informed next steps with a clinician, not self-diagnosis.
This is a derived marker calculated from measured cortisol and DHEA-S results; it is not a standalone diagnosis and should be interpreted in clinical context.
Lab testing
Order labs that include cortisol and DHEA-S
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
With Vitals Vault, you can order labs that include the inputs needed to calculate your Cortisol:DHEA-S ratio and then review the pattern in a clear, practical way. This is especially helpful when you are trying to connect day-to-day symptoms—like sleep quality, energy, and recovery—to objective hormone data.
After your results are back, PocketMD can help you summarize what changed, what looks most likely to be driving the ratio, and which follow-up labs or timing adjustments might make the next test more meaningful. If you are repeating labs, trending your results over time is often more informative than reacting to a single draw.
You stay in control of ordering and follow-up, while still having a structured path to interpretation and next steps.
- Order labs and review results in one place
- PocketMD helps you turn numbers into next-step questions
- Convenient testing through the Quest network
Key benefits of Cortisol:DHEA-S Ratio testing
- Shows whether cortisol is outweighing DHEA-S, which can signal a chronic stress pattern.
- Adds context when cortisol or DHEA-S alone looks “normal” but you still feel off.
- Helps you connect fatigue, poor recovery, and sleep disruption to measurable hormone balance.
- Supports more targeted follow-up testing, such as repeat timing or additional HPA-axis markers.
- Can be used to monitor whether lifestyle changes are shifting your stress-adaptation pattern over time.
- Highlights age- and health-related declines in DHEA-S that may raise the ratio even without high cortisol.
- Pairs well with PocketMD interpretation so you can focus on actionable drivers instead of isolated numbers.
What is Cortisol:DHEA-S Ratio?
The Cortisol:DHEA-S ratio is a calculated value that compares your cortisol level to your DHEA-S (dehydroepiandrosterone sulfate) level. Cortisol is a glucocorticoid hormone involved in energy regulation, inflammation control, and your “fight-or-flight” response. DHEA-S is an adrenal-produced hormone that serves as a precursor to sex hormones and is often described as more anabolic or protective in contrast to cortisol’s more catabolic effects.
Because these hormones can move in different directions with stress, illness, aging, sleep loss, and training load, the ratio is used as a snapshot of balance. A higher ratio generally suggests that cortisol is relatively high compared with DHEA-S, which can align with reduced stress resilience and slower recovery. A lower ratio is often interpreted as more favorable stress adaptation, especially when it matches how you feel and your other labs.
You get the most value from this marker when you interpret it alongside the actual cortisol and DHEA-S numbers, the time of day your sample was collected, and factors like medications or recent stressors.
Why a ratio can be more informative than a single hormone
Cortisol and DHEA-S do not always change together. For example, your cortisol might be in range, but your DHEA-S could be low for your age, which still produces a higher ratio. Looking at the relationship can help explain why you feel “wired but tired,” why recovery is lagging, or why stress feels harder to handle than it used to.
What this ratio can and cannot tell you
This ratio can suggest patterns consistent with chronic stress exposure or reduced anabolic reserve, but it cannot diagnose HPA-axis (hypothalamic-pituitary-adrenal axis) disorders on its own. If your symptoms are significant or your cortisol is clearly abnormal, you may need clinician-directed confirmatory testing and a broader endocrine evaluation.
How Cortisol:DHEA-S Ratio is calculated
Formula
Cortisol / DHEA-S
A lab calculates this marker by dividing your measured cortisol value by your measured DHEA-S value. Because cortisol and DHEA-S are often reported in different units and can be collected under different conditions, the ratio is most meaningful when the lab uses consistent internal rules and you compare results over time from the same testing approach.
If either input is near the assay’s detection limits, or if your cortisol was drawn at an unusual time of day, the ratio can look misleading. Always review the underlying cortisol and DHEA-S results rather than relying on the ratio alone.
What do my Cortisol:DHEA-S Ratio results mean?
Low Cortisol:DHEA-S Ratio
A lower ratio generally means your cortisol is relatively low compared with DHEA-S, which is often considered a favorable balance for stress adaptation. If you feel well, sleep well, and recover normally, a low ratio can simply reflect good resilience. However, if your cortisol is truly low and you have symptoms like dizziness, low blood pressure, or unexplained weight loss, you should discuss the full cortisol result with a clinician because the ratio alone can hide an absolute cortisol problem.
Optimal Cortisol:DHEA-S Ratio
An “optimal” ratio is one that fits your life stage, symptoms, and the actual cortisol and DHEA-S values behind it. In general, you want a balance where cortisol is not chronically dominating and DHEA-S is not markedly low for your age. If your ratio is stable across repeat testing and you feel steady energy, solid recovery, and reasonable stress tolerance, that pattern is usually reassuring.
High Cortisol:DHEA-S Ratio
A higher ratio often suggests cortisol is elevated relative to DHEA-S, which can fit with chronic stress load, sleep deprivation, overtraining, inflammation, or illness. It can also happen when DHEA-S is low (common with aging), even if cortisol is not dramatically high. If your ratio is high and you also have fatigue, poor stress tolerance, abdominal weight gain, anxiety, low mood, or reduced libido, it is a sign to look closely at sleep, workload, and the timing and context of the cortisol draw.
Factors that influence Cortisol:DHEA-S Ratio
Time of day matters for cortisol, which typically peaks in the morning and declines later, so a morning draw versus an afternoon draw can change the ratio. DHEA-S is more stable day-to-day, but it trends lower with age and can be affected by chronic illness. Medications can also shift results, including glucocorticoids (steroids), some hormonal therapies, and drugs that affect cortisol metabolism. Recent acute stress, poor sleep, intense exercise, infection, and inflammation can temporarily raise cortisol and push the ratio higher.
Frequently Asked Questions
What is a normal Cortisol:DHEA-S ratio?
There is not one universal “normal” number because the ratio depends on the lab’s calculation rules, the units used, and when cortisol was collected. The most reliable approach is to interpret your ratio alongside the underlying cortisol and DHEA-S values and compare to the reference information provided with your report. If you are tracking progress, use the same lab method and similar collection timing each time.
Does a high Cortisol:DHEA-S ratio mean adrenal fatigue?
A high ratio can match a pattern people describe as “adrenal fatigue,” meaning cortisol is relatively dominant compared with DHEA-S and you may feel depleted or less resilient. However, “adrenal fatigue” is not a formal diagnosis, and the ratio cannot confirm a specific adrenal disorder by itself. If symptoms are significant, you should review the full hormone picture and consider clinician-directed evaluation.
Can aging increase the Cortisol:DHEA-S ratio?
Yes. DHEA-S commonly declines with age, and that alone can raise the ratio even if cortisol does not increase. That is why it helps to look at your DHEA-S level relative to age expectations and not interpret the ratio in isolation.
Do I need to fast for a Cortisol:DHEA-S ratio test?
Fasting is not always required for cortisol or DHEA-S, but your collection timing and recent stressors matter more than fasting for this ratio. Follow the collection instructions on your order, and try to keep conditions consistent if you plan to repeat the test (similar wake time, similar exercise and caffeine pattern, and similar time of blood draw when possible).
What can cause a falsely high ratio?
A ratio can look high if cortisol is temporarily elevated from poor sleep, acute stress, illness, inflammation, or intense exercise shortly before the draw. It can also look high if DHEA-S is low due to age or chronic illness. Medications, especially steroid medications, can significantly affect cortisol results and should be discussed before interpreting the ratio.
Should I retest if my ratio is high?
Retesting can be useful if your result does not match how you feel, if the draw timing was unusual, or if you are making changes aimed at improving sleep, recovery, or stress load. If you retest, try to standardize timing and conditions so you can tell whether the pattern is truly changing. PocketMD can help you decide what to repeat and what additional markers might clarify the picture.