The Bone Resorption Assessment is a simple urinary test that provides an accurate assessment of the rate of bone turnover in an individual. The Bone Resorption Assessment allows the practitioner to identify those more likely to develop osteoporosis to intervene before significant loss has occurred and to monitor the efficacy of treatment regimens. It examines pyridinium crosslinks and deoxypyridinoline and is useful in identifying current rate of bone loss lytic bone disease and efficacy of bone support therapies.