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In the low-dose short test, 1 μg of an ACTH drug is injected into the patient. In the conventional-dose short test, 250 μg of drug are injected. Both of these short tests last for about an hour and provide the same information. Studies have shown the cortisol response of the adrenals is the same for the low-dose and conventional-dose tests ...
Low-dose and high-dose variations of the test exist. [4] The test is given at low (usually 1–2 mg) and high (8 mg) doses of dexamethasone, and the levels of cortisol are measured to obtain the results. [5] A low dose of dexamethasone suppresses cortisol in individuals with no pathology in endogenous cortisol production.
A low-dose ACTH stimulation test has been suggested as a sensitive test for secondary adrenal insufficiency diagnosis. [10] When compared to insulin tolerance testing [11] and the high-dose ACTH test, this test allows for a more accurate identification of patients with secondary adrenal insufficiency. [12]
In the high-dose 48-h DST, 2 mg of dexamethasone is given every 6 hours for 48 hours or a single dose of 8 mg is given. [8] This test is not needed if the 48-h low-dose DST has shown suppression of cortisol by over 30%. [8] These tests are based on the glucocorticoid sensitivity of pituitary adenomas compared to non-pituitary tumors. [8]
To determine the origin of dysfunction, the ACTH stimulation test is the best initial test as it can differentiate between primary and secondary adrenal insufficiency. [2] If cortisol levels remain low following ACTH stimulation, then the diagnosis is primary adrenal insufficiency. [2]
Adrenocorticotropic hormone is used as a medication and as diagnostic agent in the ACTH stimulation test. [ 1 ] [ 2 ] : 316, 1165 [ 3 ] : 84, 271 The form that is purified from pig pituitary glands is known as corticotropin [ 1 ] [ 2 ] : 316 is a medication and naturally occurring polypeptide tropic hormone produced and secreted by the anterior ...
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The exact dose of ACTH remains a matter of debate. [18] In the CORTICUS study, ACTH stimulation testing predicted mortality whereas baseline cortisol levels did not. [19] However, possible benefits of corticosteroid therapy do not seem to be completely predicted by ACTH stimulation testing.
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