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Table 1 Reported sensitivity and specificity of commonly utilized dynamic biochemical diagnostic tests for determining the site of excess ACTH secretion

From: Failure of functional imaging with gallium-68-DOTA-D-Phe1-Tyr3-octreotide positron emission tomography to localize the site of ectopic adrenocorticotropic hormone secretion: a case report

Diagnostic Test Sensitivity Specificity
Overnight high dose dexamethasone suppression test (8 mg) [3] 59-92% 67-100%
IV dexamethasone suppression test [5] 95-100% 40-90%
Ovine CRH stimulation test [5] 85-93% 85-90%
IPS sampling (central: peripheral gradient) [6] 81-85% 90-100%