MRCP2-4559

An older woman undergoes routine blood tests prior to a hernia repair. Her liver function tests are repeated twice, with calcium, ALT, and bilirubin within normal limits, but her alkaline phosphatase level is elevated at 380. Upon further inquiry, she reports drinking a glass of wine and smoking 6 cigarettes per day, as well as experiencing hip and lower back pain. She has also recently been evaluated for hearing impairment. What is the most appropriate test to confirm the diagnosis?