Diurnal salivary cortisol panel (4-point / "adrenal stress")

ND-recommended test reviewed: diurnal salivary cortisol panel (4-point / adrenal stress index).
Indications reviewed: no validated indication for multi-point salivary cortisol; discriminating features of Cushing's or adrenal insufficiency not present.
Not ordered. Rationale discussed: diurnal cortisol pattern has no validated diagnostic use; 'adrenal fatigue' not a recognized diagnosis. Ref: Cadegiani and Kater 2016; Endocrine Society.
Patient informed test available privately via ND. Patient given info page: https://labs.ajaxharwoodclinic.com/cortisol-saliva-diurnal/patient
Revisit if: features of Cushing's syndrome or adrenal insufficiency appear.

Indicated when

None recorded.

Not indicated when

• —4-point diurnal salivary cortisol, 'cortisol awakening response,' or 'adrenal stress index' panels ordered to investigate fatigue, burnout, or low energy: no validated diagnostic use exists for these patterns [1, 2]
• —Screening asymptomatic or non-specifically fatigued patients for 'adrenal fatigue,' which is not a recognized diagnosis [2, 1]
• —Obesity or metabolic syndrome alone, without discriminating Cushing's features [3, Pituitary Society 2021]

Why not

There is no reference range for the multi-point salivary cortisol pattern that is tied to a recognized disease. In the largest systematic review of 'adrenal fatigue' research (58 studies), the three most-studied tests were exactly these formats: awakening cortisol, cortisol awakening response and salivary cortisol rhythm. The review found 'an almost systematic finding of conflicting results' [1]. An abnormal-looking curve can lead to supplements or treatment for a condition that isn't recognized, and can delay the search for the real cause of fatigue.

Better first step

Assess for a real cause of fatigue (sleep disorder, depression or anxiety, anemia, thyroid disease, diabetes, or true adrenal insufficiency) with history, exam, and standard first-line bloodwork; reserve a single late-night salivary cortisol for patients who have discriminating Cushing's features [3].

Typical ND rationale

An ND may order a 4-point diurnal or 'adrenal stress index' salivary panel to see whether a patient's cortisol rhythm is flattened or reversed, reasoning that a disrupted pattern explains fatigue, poor sleep, and stress intolerance, and that saliva testing captures active hormone through the day in a way a single blood draw cannot.

Ontario coverage & CONO orderability

OHIP status

unverified

The 2026 Schedule lists one 'Cortisol' line (L303) with no specimen qualifier, so whether a physician-ordered salivary cortisol is billable under it is unverified. The salivary panels seen in the Ontario ND landscape are sold directly to patients. ND-ordered testing is patient-paid regardless (Reg. 552 s. 22).

CONO orderable

Yes — CONO list #173

CONO list item 173, saliva: 'Cortisol – bound and unbound, no differentiation.' The CONO list authorizes the assay, not a specific collection protocol; NDs use it for both a single late-night sample and multi-point diurnal panels.

Linked conditions

• "Adrenal fatigue" ↗

Counselling script

“Your tiredness is real, and I want to find the cause. This four-times-a-day saliva cortisol test has been studied a lot, and the results haven't been consistent enough to diagnose anything, including adrenal fatigue, which isn't a recognized condition. Let's check the common, treatable causes first.”

Revisit if

• —Features of Cushing's syndrome appear (bruising, plethora, proximal weakness, wide purple striae)
• —Features of adrenal insufficiency appear (weight loss, orthostatic dizziness, hyperpigmentation, low sodium or high potassium)

References

1. [1]BMC Endocrine Disorders (2016). Adrenal fatigue does not exist: a systematic review. linkolder guideline58-study systematic review; awakening cortisol, CAR and salivary rhythm were the most-assessed tests and gave almost systematically conflicting results; 'adrenal fatigue' unsubstantiated
2. [2]Endocrine Society (patient education) (2026). Adrenal Fatigue. linkEndocrine Society: no test can detect 'adrenal fatigue'
3. [3]Endocrine Society (2008). The Diagnosis of Cushing's Syndrome: An Endocrine Society Clinical Practice Guideline. linkolder guidelineThe validated salivary use is a single late-night sample for suspected Cushing's
4. [4]Q Wellness (2026). Laboratory Testing. linkExample of an Ontario ND clinic offering saliva hormone testing directly to patients