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Section: Clinical Chemistry5.10 Tumor Markers
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A person presents with a cushingoid appearance and an elevated 24-hour urinary cortisol level. The plasma adrenocotropic hormone (ACTH) is very elevated, and the physician suspects the cause is ectopic ACTH production. Which test would be most useful in substantiating this diagnosis?
Plasma cortisol
CA-50
Alkaline phosphatase isoenzymes
AFP