Sleep problems are rarely about willpower or sleep hygiene alone. Behind a night of tossing and turning is a chemistry story — chiefly the nightly rise of melatonin and its relationship with cortisol. The DUTCH™ test captures that story by measuring melatonin as 6-OHMS, mapping cortisol across the day, and adding organic-acid markers that link sleep to your neurotransmitters. This guide explains what those markers mean and how to use them to understand poor sleep.
Key takeaways
- Melatonin is measurable. The DUTCH™ test reports melatonin as 6-OHMS, reflecting your overnight production rather than a fleeting blood level.
- Cortisol is melatonin's counterweight. Night-time cortisol that stays high can suppress melatonin — read the daily cortisol curve alongside it.
- The morning surge counts too. A healthy Cortisol Awakening Response helps set the day–night rhythm that governs sleep.
- Organic acids add context. Selected OAT markers connect sleep to neurotransmitter and B-vitamin status.
- One panel, full picture. The DUTCH™ Complete pairs melatonin with cortisol and hormones.
What melatonin does
Melatonin is the hormone your pineal gland releases as darkness falls. It is often described as the "sleep hormone," but its real job is timing: melatonin tells every system in your body that night has arrived, lowering core temperature, easing you toward sleep, and anchoring your circadian rhythm. It rises through the evening, peaks in the middle of the night, and fades by morning so you can wake feeling alert.
When that rise is blunted — by light exposure, chronic stress, shift work or aging — sleep onset drags, sleep becomes lighter, and the whole day–night rhythm loosens. The difficulty for most people is that melatonin is invisible; you feel the consequences without any way to see the cause. That is precisely the gap the DUTCH™ test fills.
Measuring melatonin as 6-OHMS
Melatonin itself is hard to pin down in the blood because it swings so quickly. The DUTCH™ test sidesteps that by measuring its main urinary metabolite, 6-OHMS (6-hydroxymelatonin-sulfate). Because you collect the relevant sample at waking, 6-OHMS reflects how much melatonin your body actually produced over the night — a stable, practical readout rather than a snapshot that could be caught on the way up or down.
A low 6-OHMS suggests under-production of melatonin overnight, which can explain trouble falling or staying asleep. A robust 6-OHMS points elsewhere for the cause of poor sleep — often to cortisol. To see how the marker is displayed, review a sample DUTCH™ report, and for the fundamentals of the dried-urine format, start with what the DUTCH™ test is.
The cortisol–melatonin balance
Melatonin never works alone. It has a partner — and an opposite — in cortisol. In a healthy rhythm, the two seesaw: melatonin climbs at night while cortisol sinks to its lowest, then cortisol surges in the early morning as melatonin recedes. Sleep depends on that clean hand-off.
Problems arise when the seesaw jams. If cortisol stays elevated into the evening — a classic stress pattern — it can override melatonin's signal and leave you wired at bedtime, or waking at 3 a.m. This is why melatonin is best read next to the full cortisol and adrenal health picture rather than in isolation. The morning side of the rhythm matters too: a healthy Cortisol Awakening Response helps consolidate the day–night contrast that good sleep relies on.
Wired but tired? Look at the whole rhythm
Plenty of people take melatonin supplements and still sleep badly, because their real problem is cortisol running high at night, not a melatonin shortage. Seeing both curves together on one report is what separates "make more melatonin" from "calm the evening cortisol" — two very different action plans that no single-marker test can distinguish.
Organic acids and neurotransmitters
The DUTCH™ Complete also reports a set of organic-acid (OAT) markers that add a neurological layer to the sleep picture. These include downstream markers related to dopamine and serotonin metabolism — serotonin being melatonin's direct precursor — and markers tied to B-vitamin status that the body needs to build these messengers. When sleep problems travel with low mood, anxiety or poor stress resilience, these OAT markers help a practitioner see whether the raw materials and pathways for calming neurotransmitters are in good shape.
Common sleep patterns on the report
- Low 6-OHMS, normal cortisol — under-production of melatonin; the focus tends to be light exposure, evening routine and circadian support.
- Normal 6-OHMS, high night cortisol — a stress-driven pattern where calming the evening cortisol matters more than melatonin itself.
- Low 6-OHMS and a flattened cortisol curve — a broader rhythm disruption often seen with burnout and shift work.
- Sleep issues plus mood symptoms — where the OAT and neurotransmitter markers earn their place, connecting sleep to the wider set of hormone imbalance symptoms.
See what your sleep chemistry is doing
Choose a DUTCH™ panel and start your medical intake — a contracted practitioner reviews it and orders the right test. Priced in USD, shipped free across the US.
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For a complete sleep-and-stress picture, the DUTCH™ Complete ($499) includes melatonin (6-OHMS), the daily cortisol rhythm, the OAT markers and your sex hormones in one at-home collection. If you want the fullest view of the morning cortisol surge as well, the DUTCH™ Plus ($675) adds the Cortisol Awakening Response on top of the Complete panel.
Collection is done at home, results are typically ready about 2–3 weeks after the lab receives your samples, and a practitioner can walk you through what the melatonin and cortisol curves mean together. Begin whenever you are ready with the medical intake form, or compare options and pricing on the cost page.
Frequently asked questions
Yes. The DUTCH™ test measures melatonin as 6-OHMS (6-hydroxymelatonin-sulfate), the main metabolite the body excretes in urine. Because the sample is taken at waking, it reflects your overnight melatonin production rather than a single blood level.
6-OHMS is 6-hydroxymelatonin-sulfate, the primary breakdown product of melatonin found in urine. Measuring it gives a stable, practical read on how much melatonin your body produced overnight, which a fleeting blood measurement struggles to capture.
Cortisol and melatonin work on opposite schedules: melatonin should rise at night to promote sleep while cortisol stays low, then cortisol rises in the morning as melatonin falls. If cortisol is high at night, it can suppress melatonin and disrupt sleep, which is why the DUTCH™ test reads both.
Melatonin (6-OHMS) is included in the DUTCH™ Complete at $499 and the DUTCH™ Plus at $675, alongside the cortisol rhythm and organic-acid markers, so you can see sleep, stress and hormones together.
This article is educational and reflects functional-health perspectives. It is not medical advice, diagnosis, or treatment. The DUTCH™ test is a wellness screening tool interpreted by a qualified practitioner. Always consult a healthcare provider about your individual situation.