Some people may quickly process (metabolize) the
dose of dexamethasone. In these people, cortisol levels will not drop unless a
higher dose of the medicine is given.
What To Think About
doctors think that a 24-hour urine free cortisol test is more accurate than an
overnight dexamethasone suppression test. Like an overnight dexamethasone
suppression test, a 24-hour urine free cortisol test is used to look for
Cushing's syndrome. To learn more, see the topic Cortisol in Urine.