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Cortisol follows a circadian rhythm, and to accurately measure cortisol levels is best to test four times per day through saliva. An individual may have normal total cortisol but have a lower than normal level during a certain period of the day and a higher than normal level during a different period.
The average level of salivary cortisol upon waking is roughly 15 nmol/L; 30 minutes later it may be 23 nmol/L, though there are wide variations. [3] The cortisol awakening response reaches a maximum approximately 30 minutes after awakening though it may still be heightened by 34% an hour after waking. [3]
In 2010 Sakihara, et al., evaluated the usefulness and accuracy of salivary, plasma, and urinary cortisol levels and determined salivary cortisol to be the "method of choice" for Cushing's syndrome screening. [23] In 2008 Restituto, et al., found early morning salivary cortisol to be "as good as serum" as an Addison's disease screening ...
Levels of cortisol and ACTH both elevated; 24-hour urinary cortisol levels elevated; Dexamethasone suppression test [3] Late night salivary cortisol (LNSC) [4] Loss of diurnal variation in cortisol levels (seen only in true Cushing's Syndrome) High mean corpuscular volume and gamma-glutamyl transferase may be clues to alcoholism
To confirm inappropriately low cortisol secretion, testing can include baseline morning cortisol level in the blood or morning cortisol level in the saliva. [2] Cortisol levels typically peak in the morning; thus, low values indicate true adrenal insufficiency. [2] Urinary free cortisol can also be measured, but are not necessary for diagnosis. [2]
The late-night or midnight salivary cortisol test has been gaining support due to its ease of collection and stability at room temperature, therefore it can be assigned to outpatients. [8] The test measures free circulating cortisol and have both a sensitivity and specificity of 95–98%. [8] [11] This test is especially useful for diagnosing ...
Urinary cortisol levels directly reflect circulating free cortisol. [54] Excess cortisol saturates binding proteins and is eliminated in urine as free cortisol, making it a helpful diagnostic for hypercortisolemia. [56] Values four times higher than the top range of normal are uncommon, especially in Cushing's disease. [57]
Cortisol levels are lower in CAH subjects, on average, [38] however, in milder cases cortisol levels can be normal, but, this has not been yet well studied. Cortisol measurement using immunoassays is prone to cross-reactivity with various substances including 21-deoxycortisol that raises due to 21-hydroxylase deficiency, leading to falsely high ...