When<unk> 's<unk>  is suspected, either a dexamethasone suppression test (administration of dexamethasone and frequent determination of cortisol and ACTH level) or a 24-hour urinary measurement for cortisol offer equal detection rates. Dexamethasone is a glucocorticoid and simulates the effects of cortisol, including negative feedback on the pituitary gland. When dexamethasone is administered and a blood sample is tested, high cortisol would be indicative of<unk> 's<unk> .
A novel approach, recently cleared by the US FDA, is sampling cortisol in saliva over 24 hours, which may be equally sensitive, as late night levels of salivary cortisol are high in<unk> oid patients. Other pituitary hormone levels may need to be ascertained.
Cushing's syndrome laboratory findings
Acromegaly laboratory findings
Secondary adrenal insufficiency laboratory findings
Adrenal insufficiency laboratory findings
Euthyroid sick syndrome laboratory findings
Cushing's syndrome physical examination
Addison's disease laboratory findings
Graves' disease laboratory findings