Bone metabolism assay kits are clinical lab tests used to determine and test for metabolic bone disorders; most common disorder known is osteoporosis. Metabolic bone disorders are a result of abnormalities in vitamin D, minerals (e.g. calcium, magnesium, phosphorus, etc.), and bone mass and structure. Other known conditions include Paget's disease, rickets, osteomalacia, and osteitis fibrosa cystica.