A 40-year-old woman presents with hypertension, hypokalemia, and suppressed plasma renin activity. Aldosterone-to-renin ratio is markedly elevated. What is the next best diagnostic step?
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A
Proceed directly to adrenal vein sampling
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B
Confirm with oral sodium loading or fludrocortisone suppression test
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C
Start spironolactone empirically
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D
Obtain urine catecholamines