Bone Densitometer (Bone Density Scan)
  Bone densitometry, using an advanced technology called
DXA (short for dual-energy x-ray absorptiometry), safely,
accurately and painlessly measures bone mineral density.
Bone densitometers with an additional capability called
Instant Vertebral AssessmentTMor IVA, also produce a x-ray
of the entire spine for the assessment of vertebral (spine)

IVA is basically a rapid (10-second), low-dose x-ray scan
of the spine, taken in combination with a standard bone
density test. With IVA, doctors can see existing vertebral
fractures, which may indicate the need for more aggressive
treatment, even if bone density results are in the “normal”

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