Ajax Harwood Clinic
Melatonin (saliva or urine)
This test doesn't have a proven medical use for the reasons people usually ask about it.
What this test is
Melatonin is the hormone that helps set your sleep clock. Some clinics test it in saliva or urine. This is meant to check sleep or 'adrenal' problems. Melatonin levels change a lot with light and with sample timing. There is no normal result that tells your doctor what to do next. One special use belongs to sleep research clinics, not routine care. If sleep is the real problem, other tools help more. These include a sleep history, a sleep diary, or a referral to a sleep doctor.
Want to see the full clinical reasoning? The reference we use for this test is open to anyone — it is detailed and written for clinicians, and you are welcome to read it.
Open the clinician reference →Looking for other tests, or more on a condition an ND raised? Explore ask.ajaxharwoodclinic.com →
General health information for Ajax Harwood Clinic patients and the public — not medical advice, and not a substitute for seeing your own doctor. Last reviewed 2026-09-23.