Radiology reporting standard

DEXA

DEXA bone density classification applies the World Health Organization T-score thresholds (normal at -1.0 or above, low bone mass between -1.0 and -2.5, osteoporosis at -2.5 or below) at the diagnostic sites the International Society for Clinical Densitometry specifies.

DEXA through RadVector API DEXA in RadVector Reporting

Validated packValidated criteria pack (2026.2, validated 2026-10-01); verdicts may be marked usable for output.

At a glance

What DEXA is

Full name: Bone density classification (WHO T-score criteria with ISCD 2019 Official Positions)
Edition RadVector applies: WHO 1994 T-score criteria with ISCD 2019 Official Positions
Published by: World Health Organization; International Society for Clinical Densitometry (ISCD)
Applies to: Dual-energy X-ray absorptiometry (DXA) bone density exams.
Modality: DXA bone densitometry

Official source: ISCD 2019 Official Positions

DEXA categories

Normal: T-score -1.0 or higher.
Low bone mass (osteopenia): T-score between -1.0 and -2.5.
Osteoporosis: T-score -2.5 or lower.
Z-score: Used instead of T-score for premenopausal women and men under 50.

A short summary in our own words. Use the official DEXA documents for the complete criteria.

How RadVector applies it

DEXA, applied the same way every time.

The same deterministic engine grades DEXA inside RadVector Reporting and through RadVector API, and a test keeps the two answers identical.

Validated criteria pack: a DEXA verdict can be marked usable for output.
Reads T-scores and Z-scores as densitometry reports write them, by site and from score tables, using only the current exam's rows.
Uses the lowest T-score among the ISCD diagnostic sites and checks that the report's stated category agrees with it.

Radiologists and imaging centers

RadVector Reporting supplies the DEXA category and recommendation to the report draft from the radiologist's own findings, cites the guidance applied, and keeps a per-report governance record. The radiologist signs.

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Software teams and AI companies

RadVector API returns the DEXA verdict with pack version, validation status and a trace id, as JSON or FHIR R4, with a sandbox key and synthetic fixtures to start.

Developer guide

Hospitals and enterprise imaging

One versioned DEXA implementation across reporting, QA and other AI systems' results, with an audit trail of which pack version graded each report.

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DEXA questions

What T-score means osteoporosis?

Under the World Health Organization criteria, a T-score of -2.5 or lower at a diagnostic site means osteoporosis, a T-score between -1.0 and -2.5 means low bone mass (osteopenia), and -1.0 or higher is normal. RadVector applies these thresholds at the ISCD 2019 diagnostic sites.

Can RadVector check a bone density report's category?

Yes. RadVector reads the T-scores from the report or worksheet, assigns the WHO category from its validated DEXA pack, and flags a report whose stated category does not match the lowest diagnostic-site T-score for the radiologist to review.

Other reporting standards

RadVector is clinical decision support for qualified professionals, not a diagnostic device; the radiologist makes the final determination.