A 54-Year-Old Man Comes to the Emergency Department Because of Episodic

A 54-year-old man comes to the emergency department because of episodic palpitations for the past 12 hours. He has no chest pain. He has coronary artery disease and type 2 diabetes mellitus. His current medications include aspirin, insulin, and atorvastatin. His pulse is 155/min and blood pressure is 116/77 mm Hg. Physical examination shows no abnormalities. An ECG shows monomorphic ventricular tachycardia. An amiodarone bolus and infusion are given, and the ventricular tachycardia converts to normal sinus rhythm. He is discharged home with oral amiodarone. Which of the following should be tested before initiating this medication?

A) 24-hour urinary cortisol
B) 24-hour urinary metanephrines
C) Oral glucose tolerance test
D) Serum prolactin
E) Serum testosterone
F) Serum TSH