Extended "Functional Medicine" Hormone Panels: Salivary Cortisol Rhythm and Dried-Urine (DUTCH) Testing

What is actually established

Cortisol and sex-hormone metabolites can genuinely be measured in saliva and in dried urine, and the underlying chemistry is not in dispute. Salivary cortisol has a specific, validated clinical role: as part of a defined diagnostic protocol for confirming or excluding adrenal insufficiency in patients who are already being worked up for suspected Addison's disease. In that narrow context, a cohort study found it performed well as a noninvasive marker alongside standard testing.[4]

Separately, a method-comparison study conducted with involvement from the manufacturer of the dried-urine (DUTCH) test reported correlation between dried-urine estrogen and progesterone metabolite results and serum or traditional 24-hour urine collection for select metabolites. This is analytical validation, meaning the dried sample and the reference method tend to agree on the number produced, not clinical validation, meaning that using the number to guide a diagnosis or treatment decision improves outcomes.[3]

What the evidence for this specific use actually shows

The use these panels are most commonly marketed for, identifying "adrenal fatigue" or a broader pattern of "hormonal dysfunction" in patients who are ambulatory, functioning, and often asymptomatic on standard blood work, is a different question from the validated use above, and the evidence for it is not supportive. A systematic review of 58 studies examining whether "adrenal fatigue" is a genuine, coherent medical entity found no scientific evidence for it and no consistent correlation between the cortisol measures used to diagnose it and the symptom cluster (fatigue, low energy, poor stress tolerance) it is supposed to explain.[1]

A more recent narrative review by an endocrinologist reached the same conclusion from a different angle, stating plainly that the salivary cortisol profiles marketed for adrenal fatigue have never been scientifically validated, and that patients with a genuine concern about adrenal function should be evaluated with standard serum cortisol and ACTH testing rather than a salivary rhythm panel.[2]

The trap: a changed marker is not a diagnosis

The pattern to watch for with these panels is that a lab report showing a cortisol curve that looks "flat" or "blunted," or a DUTCH report flagging a metabolite ratio as out of range, is often presented as though it explains a patient's fatigue or stress symptoms. Neither of the validated findings above supports that inference. Correlation between a dried-urine result and a serum result tells you the assay is measuring the analyte consistently, not that the analyte's fluctuation within a normal or borderline range is causing, or even reliably associated with, the symptoms the patient came in with. Cortisol itself has a wide normal diurnal variation influenced by sleep, caffeine, stress, and sampling time, so a single "abnormal" curve on an unvalidated interpretive scale is not the same as a diagnosis.[1][2]

What remains uncertain, and the null finding that should not be skipped over

The Cadegiani and Kater review is a negative finding and should be stated as one rather than softened: across 58 studies, the researchers did not find scientific evidence that adrenal fatigue is a genuine medical entity. That is a null result on the underlying condition these panels are built to detect, not merely a caution about one test. It is also true that this is a review of a heterogeneous and often low-quality evidence base, and that a negative systematic review cannot prove an entity does not exist in any form, only that current evidence does not establish it. Separately, the DUTCH analytical correlation data comes from a study connected to the test's manufacturer, addresses agreement between methods rather than clinical outcomes, and has not been adopted or endorsed by mainstream endocrinology bodies as a substitute for standard blood testing. Whether dried-urine sampling could have narrower, validated uses in specific research or clinical contexts remains an open question rather than a settled negative.[1][3]

What this means for you

AION does not use salivary cortisol rhythm panels or DUTCH testing to diagnose "adrenal fatigue" or to screen asymptomatic patients for hormonal dysfunction, because the evidence does not support that use. Diagnostics come first, and the diagnostic tools we reach for are the ones with an established evidence base for the question being asked.

Where a patient has genuine clinical signs of adrenal or hormonal disease, the physician-led work-up follows the validated route, standard serum hormone and ACTH testing, interpreted by the treating physician, with specialist endocrinology referral where indicated, rather than a fixed panel applied to everyone. There is no standing protocol at AION that orders these functional panels by default; any hormonal testing is decided case by case by the physician based on the patient's actual presentation.[4]