Which diagnostic test is the most helpful in distinguishing primary from secondary adrenocortical insufficiency?
1. Magnetic resonance imaging (MRI)
2. A computed tomography (CT) scan
3. Cosyntropin (Cortrosyn)
4. Dexamethasone (Decadron)
Correct Answer: 3
Rationale 1: An MRI does not distinguish primary from secondary adrenocortical insufficiency.
Rationale 2: A CT scan does not distinguish primary from secondary adrenocortical insufficiency.
Rationale 3: The primary use of cosyntropin (Cortrosyn) is to diagnose adrenal disorders.
Rationale 4: Dexamethasone (Decadron) is not used to diagnose adrenal disorders.
Global Rationale: The primary use of cosyntropin (Cortrosyn) is to diagnose adrenal disorders. MRI, CT scan, and dexamethasone are not used to diagnose adrenal disorders.
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