Lab
Corticotropin Stimulation Test
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Corticotropin Stimulation Test
, Cosyntropin Stimulation Test, ACTH Stimulation Test
See Also
Addison Disease
Indications
Adrenal Insufficiency
evaluation
Serum Cortisol
8am level decreased
Technique
Obtain Baseline Labs
Plasma Adrenocorticotropic Hormone (ACTH) Level
Serum Cortisol
level
Plasma aldosterone
Plasma renin activity
Administer cosyntropin (ACTH)
Administer ACTH 250 mcg IV
Repeat
Serum Cortisol
Obtain
Serum Cortisol
at 30 and 60 minutes after IV ACTH
Interpretation
Low cortisol level (<18 mcg/dl) and high plasma ACTH (>50 pg/ml)
Primary
Adrenal Insufficiency
Low cortisol level (<18 mcg/dl) and low plasma ACTH
Secondary
Adrenal Insufficiency
References
May (1985) Am J Med 79(6): 679-84 [PubMed]
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