A cortisol blood test is covered by OHIP in Ontario when a physician or nurse practitioner orders it to investigate a suspected adrenal or pituitary problem, and it is usually drawn first thing in the morning at any Bio-Test centre without an appointment. It is not a test for tiredness: 'adrenal fatigue' is not a recognised medical diagnosis, and salivary cortisol panels sold for it are not insured and not used by endocrinologists.
What cortisol does and why timing matters
Cortisol is the body's main stress hormone, made by the adrenal glands under instruction from the pituitary. It follows a daily rhythm: highest between about 6 and 8 am, lowest around midnight. That is why a single random level tells your provider little, and why the standard test is a morning (8 am) serum cortisol, sometimes paired with ACTH, or a timed test such as a dexamethasone suppression test or an ACTH stimulation test.
When a cortisol test is ordered
- Suspected adrenal insufficiency (Addison's disease): fatigue with weight loss, low blood pressure, salt craving, skin darkening, or after stopping long-term steroid medication.
- Suspected Cushing's syndrome: weight gain around the trunk, easy bruising, high blood pressure, muscle weakness, or long-term steroid use.
- Pituitary disease, or monitoring after adrenal or pituitary surgery.
- Certain critical illnesses, in hospital.
The 'adrenal fatigue' question
Tiredness, poor sleep and low mood are real, but the Endocrine Society and the Canadian Society of Endocrinology and Metabolism state that 'adrenal fatigue' does not exist as a diagnosis, and that four-point salivary cortisol panels do not identify a treatable condition. These panels are uninsured in Ontario and, if bought privately, cannot be run on an OHIP requisition. If you are persistently tired, the useful path is a provider visit and the blood tests for fatigue that can find a treatable cause.
Preparation for a morning cortisol
- Arrive when the centre opens; Bio-Test's Ottawa centres open at 7:30 am, so an 8 am draw is straightforward.
- Tell the desk about any steroid medication, inhaler, cream or injection, and about oral contraceptives, which raise total cortisol.
- Follow your provider's instructions exactly for suppression or stimulation tests; they include specific timings.
- No fasting is required unless combined with other fasting tests.
Is a cortisol test covered by OHIP?
Yes, when ordered by an authorized provider for a clinical reason such as those above. Cortisol requested as part of a wellness, anti-ageing or 'stress' panel is uninsured and patient-pay; the desk confirms before collection. See what OHIP covers and our hormone tests guide.
Getting a cortisol test in Ottawa
Walk in early to any Bio-Test centre with your requisition and health card. Results go to your ordering provider within 24 to 48 hours and to the patient portal; because cortisol depends on timing and medications, your provider interprets it in context rather than against a single range.