A 52-year-old man with Stage 4 CKD (eGFR 22 mL/min/1.73m²) presents with bone pain and muscle weakness. Serum calcium is 7.8 mg/dL, phosphate 5.2 mg/dL, and alkaline phosphatase is elevated. Which investigation is most appropriate to confirm the type of renal osteodystrophy?

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