Osteoporosis is a decrease in bone density that puts a person at risk for future fractures. It is diagnosed by using an x-ray test called dual-energy x-ray absorptiometry (or DXA). This test shows whether a person's bone density is normal or has decreased. Bone density is important, but it is not the only risk factor for future fracture. Age, smoking, and leg strength also influence a person's risk for fracture. Experts have developed ways to estimate the probability that someone will have a fracture based on all of his or her risk factors, including bone density. These experts now recommend that doctors calculate that probability for people having bone density testing and recommend treatment based on that probability. In 2006, authorities in Manitoba, Canada, took that advice. When women had bone density testing, authorities calculated their fracture probability and reported it along with the bone density test results.