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Cortisol Suppression Test in Patients with Elevated Adrenocorticotropic Hormone Levels

[+] Article, Author, and Disclosure Information

Grant support: National Institutes of Health training grant HL 07236; the studies were done at a Clinical Research Center, supported by grant 5-M01RR00888 from the Division of Research Resources of the National Institutes of Health.

©Requests for reprints should be addressed to Robert G. Dluhy, M.D.; Endocrine-Hypertension Division, Brigham and Women's Hospital, 75 Francis Street; Boston, MA 02115.

Boston, Massachusetts

© 1982 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1982;96(3):277-280. doi:10.7326/0003-4819-96-3-277
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Increased adrenocorticotropic hormone (ACTH) levels after bilateral adrenalectomy could be secondary to a pituitary tumor, under replacement with cortisol, or an abnormality in the hypothalmic-pituitary-adrenal feedback loop. To distinguish between these possibilities, ACTH levels were measured before and after cortisol infusion (20 mg/h for 4 hours) in five groups: normal volunteers; patients with idiopathic adrenal insufficiency; and with bilateral adrenalectomy for Cushing's syndrome with no roentgenographic evidence of pituitary tumor, with pituitary tumors, and with equivocal roentgenographic studies (suspect pituitary tumors). Control ACTH levels in all groups of patients were higher than in normal volunteers but there was overlapping. Cortisol infusion suppressed ACTH in all subjects but the reductions in the last two groups were less than in the first three. The cortisol suppression test appears to be useful in determining whether increased ACTH level after adrenalectomy is due to a pituitary tumor.





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