DEXA (Dual Emission Xray Absorptiometry) is a bone density test. It can evaluate the density of the bones in the lumbar spine and the hip. It can also evaluate the forearm if there is a reason why one of the other areas cannot be checked, such as metal rods in the spine, or a hip replacement in the hip. As we get older osteoporosis becomes more common, as the framework of the skeleton becomes thinner, and therefore less strong. There are several medicines available for osteoporosis, and bone density testing enables doctors to decide if a patient is a candidate for treatment with these medicines.