Evaluation of a six-hour combined dexamethasone suppression/ACTH stimulation test in dogs with hyperadrenocorticism.

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Abstract

Seventeen dogs with hyperadrenocorticism were studied. Three dogs had functioning adrenocortical tumors and 14 had pituitary-dependent hyperadrenocorticism. Each dog was evaluated by determining the endogenous plasma ACTH concentration and by performing 4 tests: ACTH stimulation, dexamethasone screening, dexamethasone suppression, and a 6-hour combined dexamethasone suppression/ACTH stimulation test. The combined test was less reliable as a screening test in diagnosing hyperadrenocorticism than was the dexamethasone screening test or the ACTH stimulation test. Compared with the endogenous plasma ACTH concentration, results of the dexamethasone suppression portion of the combined test were less reliable in distinguishing dogs with adrenocortical tumors from those with pituitary-dependent hyperadrenocorticism. It was concluded that the combined test cannot be recommended for use.

Original languageEnglish (US)
Pages (from-to)1562-1566
Number of pages5
JournalJournal of the American Veterinary Medical Association
Volume189
Issue number12
StatePublished - Dec 15 1986

ASJC Scopus subject areas

  • veterinary(all)

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