Risks and limits of Cortisol Check

A cortisol check (e.g., saliva or blood test) measures the stress hormone but is subject to strong natural fluctuations (circadian rhythm, acute stress, sleep quality). A single measurement is therefore of limited value; reliable assessment requires multiple samples at specific times. Medications (e.g., corticosteroids, birth control pills) and medical conditions (e.g., Cushing's, adrenal insufficiency) can alter results. Most consumer tests lack clinical validation and cannot replace professional diagnosis. An abnormal value alone does not justify treatment. The evidence for routine self-testing in healthy individuals is weak; it may cause unnecessary anxiety rather than health improvement. If adrenal disease is suspected, consult an endocrinologist.