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in c/o dexamethasone treatment : levels of glucocorticoid in the body, rise and there is negative feedback causing the ACTH to reduce. so the endogenous sr. cortisol levels fall? kindly explain. thanks.:confused:
 

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dexamethason suppress ACTH and so then we measure serum cortisol level not serum dexamethasone level.
Important pharmacologic property of dexa to remember is that it has zero mineralocorticoid activity.
 

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Frankly I didn't get the question either.. but dexamethazone is not detected in laboratory cortisol assays if that's what you are asking about, this is the reason it is the durg used in the test, and the naming of the test.
 
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