was ist cortisol — which blood markers matter?

Cortisol is a vital steroid hormone produced by the adrenal cortex, regulating metabolism, immune response, and stress. Key blood markers for assessing the cortisol axis include: morning serum cortisol (reference ~5–25 µg/dl, time- and lab-dependent), ACTH (adrenocorticotropic hormone) to differentiate primary from secondary adrenal insufficiency, and DHEA-S as an adrenal androgen marker. A 24-hour urinary free cortisol is the gold standard for Cushing's syndrome screening. Dynamic tests like dexamethasone suppression and CRH stimulation are used in endocrinology. Important: single cortisol measurements are highly variable due to circadian rhythm, stress, sleep, diet, and medications (e.g., glucocorticoids, estrogens). The provided context lacks specific information on cortisol blood markers; this answer is based on general medical knowledge. Evidence: unclear due to no relevant sources in context. Safety note: Suspected adrenal disorders require medical evaluation, not self-diagnosis.