DEXA

A bone densitometry scan, also called Dual-Energy X-ray Absorptiometry (DEXA or DXA) or simply a bone density scan uses an enhanced form of X-ray (radiograph) technology that applies a very small dose of ionizing radiation. DEXA is most often performed on the lower spine and hips and is the standard test for measuring bone mineral density. It is more effective in measuring bone density than a standard X-ray and is the exam used most often in diagnosing osteoporosis, a condition that thins and weaken the bones of women after menopause and can also affect men. DEXA is also used to assess a patients risk for developing fractures.

Portable DEXA devices, including some that use ultrasound waves rather than X-rays, measure the wrist, fingers or heel and are sometimes used for screening purposes.

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