A 48-year-old woman is diagnosed with stage 2 hypertension (BP 160/100 mmHg). Her workup for secondary causes includes serum electrolytes (normal), renal function (eGFR 92 mL/min/1.73m²), 24-hour urine metanephrines (normal), renal artery duplex ultrasound (normal), and thyroid function tests (normal). She is started on antihypertensive therapy. Which of the following investigations is NOT routinely indicated in the initial evaluation of all newly diagnosed hypertensive patients?

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