DEXA scan is an x-ray scanning test to measure and analyse the bone composition of an individual. It tests the bone mineral density (BMD) by passing two X-ray beams over the body. It is, therefore, known as the Dual-Energy X-ray Absorptiometry Scan. The test typically diagnoses osteoporosis, a disease which leads to a broken bone situation. It compares your bone density to the standard bone density according to your age, gender, and ethnicity. The wrist DEXA scan analyses your wrist bones through peripheral machines. It is usually a small test of 5-10 minutes.