Peripheral DXA
Also called: pDXA, forearm bone density test
What it means
Peripheral DXA (pDXA) is a quick bone density scan done at the wrist, forearm, or heel using a small portable machine, often used as a screening tool rather than a full diagnosis.
Knowing the difference helps you understand that a quick screening scan isn't the same as a full diagnostic bone density test your doctor relies on.
Peripheral DXA uses a small tabletop machine instead of the large full-body scanner used for a standard DEXA scan. It's sometimes offered at health fairs, pharmacies, or screening events because it's portable, quick, and doesn't require a radiology suite. You simply place your arm or heel into the device for a short scan.
While pDXA can flag people who might be at higher risk and encourage follow-up, it isn't used to diagnose osteoporosis or to monitor treatment over time. The official T-score cutoffs for osteoporosis and osteopenia were developed using central DXA scans of the hip and lumbar spine, not peripheral sites.
If a peripheral DXA or similar screening test suggests low bone density, the usual next step is a central DXA scan of the hip and spine for a more complete and accurate picture. Your doctor can help interpret results and decide whether further testing or monitoring makes sense for you.
A quick wrist or heel scan is a screening tool, not the same as a full bone density diagnosis.
Where this leads
WordWondering what number comes out of a full bone density test? The T-score compares your bones to a healthy young adult to help classify your bone health.
Related words
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Education only, not medical advice. Decisions about tests, medications and treatment belong with your own doctor. OsteoStrong does not diagnose, treat or cure any disease.
