Bone densitometry, using dual energy X‑ray absorptiometry, involving the measurement of 2 or more sites at least 12 months after a significant change in therapy (including interpretation and reporting), for: (a) established low bone mineral density; or (b) confirming a presumptive diagnosis of low bone mineral density made on the basis of one or more fractures occurring after minimal trauma; other than a service associated with a service to which item 12306, 12312 or 12315 applies For any particular patient, once only in a 12 month period