Bone mineral density measures the amount of loss of bone density and allows prediction of a bone fracture risk. This test allows you to be treated before a bone is broken, or determines the level of density when a bone is broken. It is also used to measure response to treatment for decreased bone density. New software now allows measurement of body mass index (BMI) and allows for assessment of the change in fat and muscle content when a patient is on a weight loss regimen or workout regimen. Some insurances cover body scans in conjunction with physician weight management protocols.