Bone densitometry, using dual energy X‑ray absorptiometry, involving the measurement of 2 or more sites (including interpretation and reporting), for: (a) confirmation of a presumptive diagnosis of low bone mineral density made on the basis of one or more fractures occurring after minimal trauma; or (b) monitoring of low bone mineral density proven by bone densitometry at least 12 months previously; other than a service associated with a service to which item 12312, 12315 or 12321 applies For any particular patient, once only in a 24 month period