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Establishment of reference values for endocrine tests. Part IV: Adrenal insufficiency
E Endert1, A Ouwehand, E Fliers
1Department of Endocrinology and Metabolism, Academic Medical Centre, University of Amsterdam, The Netherlands.
The Netherlands Journal of Medicine
|January 7, 2006
Summary
This study establishes crucial reference values for adrenal insufficiency diagnostic tests, including the short Synacthen test and insulin tolerance test. These findings aid in accurately diagnosing adrenal insufficiency in patients.
Area of Science:
- Endocrinology
- Clinical Diagnostics
Background:
- Adrenal insufficiency diagnosis relies on tests like the short Synacthen test, overnight metyrapone test, and insulin tolerance test.
- Establishing reliable reference values for these tests and baseline hormone levels is essential for accurate patient evaluation.
Purpose of the Study:
- To establish reference values for the short Synacthen test, overnight metyrapone test, and insulin tolerance test.
- To determine reference intervals for baseline morning plasma cortisol and adrenocorticotrophic hormone (ACTH) levels.
Main Methods:
- Fifty healthy subjects (20-69 years, balanced sex distribution) underwent testing.
- Standardized protocols for the short ACTH stimulation test, overnight metyrapone test, and insulin tolerance test were employed.
- Reference intervals were calculated using mean +/- 2SD of log-transformed hormone concentrations.
Main Results:
- Established reference values for 09:00 hr plasma cortisol (150-802 nmol/l) and ACTH (8-93 ng/l).
- Determined peak plasma cortisol ranges post-Synacthen (591-1,113 nmol/l) and insulin-induced hypoglycemia (557-1,015 nmol/l).
- Established reference values for plasma 11-deoxycortisol post-metyrapone (197-759 nmol/l).
Conclusions:
- Successfully established reference values for key adrenal function tests.
- These reference values are vital for evaluating patients with suspected primary or secondary/tertiary adrenal insufficiency.
- Provides a standardized basis for interpreting diagnostic test results in endocrinology.
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