Bone mineral density (BMD) testing generally correlates with bone strength and is used to diagnose osteoporosis. The BMD is measured with a dual energy x-ray absorptiometry test (referred to as a DXA scan). By measuring BMD, it is possible to predict fracture risk in the same manner that measuring blood pressure can help predict the risk of stroke.
WebMD. (2010, June 16). Retrieved from http://www.webmd.com/osteoporosis/guide/bone-mineral-density