Bone Density (DXA)
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Hologic's Discovery scanner is fast! |
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 Assessment™ or IVA,
may also produce an x-ray of the
entire spine for the assessment
of vertebral (spine) fractures.
PIC's bone densitometer can also
precisely analyze
your body fat.
During a comprehensive examination with DXA, you lie
comfortably still on a padded table while the DXA unit scans
two or more areas, usually the fracture-prone hip and spine.
Unlike typical x-ray machines, radiation exposure during bone
densitometry is extremely low—less than the radiation
exposure during a coast-to-coast airline flight. The entire
process takes only minutes to complete, depending on the
number of sites scanned. It involves no injections or invasive
procedures, and you remain fully clothed. DXA is a fast,
convenient and precise way to measure bone density and to
help determine your risk of developing osteoporosis and
future fractures.
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PIC's DXA scanner uses measurements from both the hip and lumbar spine. |
Preparing for a bone density exam
Wear comfortable clothing without zippers or metal if possible (the metal creates a false reading). Patient gowns are also available. No special prep is necessary.
Do not schedule nuclear medicine or studies with Barium prep (like a fluoroscopy study or certain CT exams) within two days before your bone density exam as the contrast used in these tests will also cause a false reading.
Please refrain from taking any calcium supplements 24 hours before a bone density exam as this may also cause a false reading.
Results
T score — This number shows the amount of bone you have compared with a young adult of the same gender with peak bone mass. A score above -1 is considered normal. A score between -1 and -2.5 is classified as osteopenia, the first stage of bone loss. A score below -2.5 is defined as osteoporosis. The T score is used to estimate your risk of developing a fracture.
