dual x-ray absorptiometry

Definition / meaning of dual x-ray absorptiometry

An imaging test that measures bone density (the amount of bone mineral contained in a certain volume of bone) by passing x-rays with two different energy levels through the bone. It is used to diagnose osteoporosis (decrease in bone mass and density). Also called BMD scan, bone mineral density scan, DEXA, DEXA scan, dual energy x-ray absorptiometric scan, and DXA.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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