Cortisol Profile, Evening
Optimal Result:
1 - 8 nmol/L.
The marker "Cortisol Profile, Evening" refers to the measurement of cortisol levels in the body during the evening hours, typically reflecting the end-of-day physiological status of an individual's hypothalamic-pituitary-adrenal (HPA) axis function. Cortisol is a glucocorticoid hormone produced by the adrenal cortex, playing a pivotal role in stress response, metabolism regulation, immune response modulation, and circadian rhythm maintenance. In a healthy individual, cortisol levels exhibit diurnal variation—peaking in the early morning shortly after awakening and declining throughout the day to reach its lowest level at night. The evening cortisol profile is crucial for assessing adrenal gland function and diagnosing disorders such as Cushing's syndrome, characterized by elevated cortisol levels, or Addison's disease, marked by insufficient cortisol production. Additionally, aberrations in the evening cortisol levels may indicate altered HPA axis responsiveness to stress or circadian rhythm disorders, potentially contributing to various health issues including sleep disturbances, obesity, depression, and cardiovascular disease. Measurement of evening cortisol can be performed through saliva, blood, or urine samples, with salivary cortisol testing being particularly favored for its non-invasive nature and the capability to reflect free, biologically active cortisol levels. Understanding the dynamics of evening cortisol levels is essential for developing targeted interventions aimed at restoring normal HPA axis function and improving overall health outcomes.
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