A DEXA scan is a special type of x-ray that measures bone mineral density (BMD). DEXA scans are often used to help diagnose bone-related conditions such as osteoporosis (or the risk of developing it).
They can also be used to assess the risk of osteoporosis developing in men and women. As well as being quick and painless, a DEXA scan is more effective than normal x-rays in identifying low bone mineral density.