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Night Cortisol Levels for Diagnosing Cushing’s Syndrome Less Accurate in Clinical Practice
In healthy individuals, the levels of cortisol — a steroid hormone secreted by the adrenal glands — go through changes over a 24-hour period, with the lowest levels normally detected at night.
But this circadian rhythm is disrupted in certain diseases such as Cushing’s syndrome, where night cortisol levels can be used as a diagnostic tool.
Among the tests that can be used to detect these levels are late-night serum cortisol (LNSeC) and late-night salivary cortisol (LNSaC) tests. Since it uses saliva samples, LNSaC is more practical and does not require hospitalization, so it is often recommended for the diagnosis of Cushing’s syndrome.