A 38-year-old woman from rural India presents with progressive bone pain, muscle weakness, and recurrent fractures. Clinical examination reveals bowing of legs and a waddling gait. Serum calcium is 7.2 mg/dL, phosphate is 2.8 mg/dL, and alkaline phosphatase is elevated at 120 IU/L. What is the most appropriate next investigation to confirm the diagnosis of osteomalacia?

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