DEXA or Bone Densitometry
Dexa is used to measure bone mineral density. The most common cause for loss of bone density is osteoporosis. A thin beam of x-ray energy is passed through the lower spine and hip regions. A computer calculates how much of x-ray energy is absorbed by the bones and compares the results with that in a younger person (eg 20 years old), and also with what is expected for a person of your age, sex and race.
The procedure takes approximately 15 to 20 minutes. Low doses of ionising radiation are used.
Bone Density is a specialised x-ray used to detect the possible presence of osteoporosis or its onset.