A 38-year-old woman from rural India presents with progressive bone pain, muscle weakness, and recurrent fractures. Biochemical investigations reveal: serum calcium 7.2 mg/dL, phosphate 2.1 mg/dL, alkaline phosphatase 120 IU/L, and PTH 180 pg/mL. What is the most appropriate next investigation to confirm the diagnosis of osteomalacia?

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