wie kann man cortisol messen — what can you do yourself?

Cortisol can be measured in several ways, but what can you do yourself? At-home options include saliva, urine, or dried blood spot tests, often marketed as 'stress tests' or 'cortisol rhythm profiles.' Saliva tests measure free cortisol and can be collected at multiple time points (e.g., morning, noon, evening) to capture the diurnal pattern. Urine tests measure free cortisol over 24 hours. Hair cortisol analysis provides a retrospective average over weeks. However, these consumer tests have limitations: single measurements are unreliable due to circadian variation, and many kits lack clinical validation. They may indicate trends but cannot diagnose conditions like Cushing's syndrome or adrenal insufficiency. For accurate assessment, clinical tests (e.g., dexamethasone suppression, ACTH stimulation) are required. Also, stress is multifactorial – cortisol alone is not a complete picture. Evidence grade: practice (common methods) with caveats. Safety note: if you suspect a cortisol disorder, consult a doctor before relying on self-tests. Interpretation should be cautious; false positives/negatives are possible.