Abstract | OBJECTIVE: We have shown previously that in contrast to the standard high-dose 250-microgram ACTH test, a low-dose 1-microgram ACTH stimulation test correctly identified all patients with pituitary disease who had impaired hypothalamo-pituitary-adrenal (HPA) function. In this study we further compared the performances of these two tests as screening procedures for possible HPA impairment. DESIGN: A comparison of the 1-microgram and the 250-microgram ACTH stimulation tests in healthy controls and in patients with pituitary disease whose HPA axis status was characterized formally by a gold standard test. SUBJECTS: A total of 89 subjects were investigated: 27 healthy normal controls, 43 patients with pituitary disease and normal HPA function, and 19 patients with various pituitary diseases and impaired HPA function. MEASURES: All 89 subjects underwent stimulation with 1 microgram ACTH; 80 also underwent the high-dose 250-microgram ACTH test. A receiver operating characteristic analysis (ROC) was performed to compare the tests. RESULTS: Using a stimulated cortisol > 500 nmol/l as the criterion for a normal response, the 1-microgram ACTH stimulation identified 18 of the 19 subjects with impaired HPA function (94.7% sensitivity with a likelihood ratio of 0.0588 for a negative test). In contrast, 15/16 passed the high-dose test (a 6.2% sensitivity with a likelihood ratio of 0.875 for a negative test). All normal controls, and 36/43 patients with preserved HPA function, passed the 1-microgram ACTH test (90% specificity). This degree of accuracy was unrivalled by the high dose test at all the cut-off levels considered. CONCLUSIONS: More sensitive and accurate, the low-dose 1-microgram ACTH test is as simple and safe as the standard 250-microgram test. We suggest it should replace it in screening for adrenal insufficiency.
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Authors | K Tordjman, A Jaffe, Y Trostanetsky, Y Greenman, R Limor, N Stern |
Journal | Clinical endocrinology
(Clin Endocrinol (Oxf))
Vol. 52
Issue 5
Pg. 633-40
(May 2000)
ISSN: 0300-0664 [Print] England |
PMID | 10792344
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
- Adrenocorticotropic Hormone
- Hydrocortisone
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Topics |
- Adrenal Insufficiency
(diagnosis)
- Adrenocorticotropic Hormone
(administration & dosage)
- Adult
- Case-Control Studies
- Drug Administration Schedule
- Female
- Humans
- Hydrocortisone
(blood)
- Hypothalamo-Hypophyseal System
(physiopathology)
- Male
- Middle Aged
- Pituitary Diseases
(diagnosis)
- Pituitary Function Tests
- Pituitary-Adrenal System
(physiopathology)
- Predictive Value of Tests
- ROC Curve
- Sensitivity and Specificity
- Stimulation, Chemical
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