AAST Organ Injury Scale
AAST Organ Injury Scale for Solid-Organ Trauma
The AAST Organ Injury Scale is the standard grading system for blunt solid-organ trauma, and its links straight to management (observation, angioembolization, surgery) make it one of the most-searched references on the trauma service. The 2018 revision was the biggest change: for spleen, liver, and kidney it incorporates CT findings of vascular injury — pseudoaneurysm, arteriovenous fistula, and active bleeding — so that a contained vascular injury can raise the grade even without gross parenchymal disruption. AAST maintains a living page with ongoing per-organ revisions, which makes “which version is current” a genuinely useful thing to track.
Version history & what changed
- Living per-organ updates2025Current
AAST maintains a living page with ongoing per-organ revisions — recent updates refine renal (2025) and pancreatic (2024) grading — so the current criteria vary by organ.
- 2018 revision2018
The biggest change: for spleen, liver and kidney it incorporates CT vascular-injury findings (pseudoaneurysm, AV fistula, active bleeding), so a contained vascular injury can raise the grade without gross parenchymal disruption.
- Original organ injury scales1989
Established organ-specific injury grades for solid-organ trauma, linked directly to management.
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Resources & links
RadPigeon is an independent radiology news digest and is not affiliated with or endorsed by American Association for the Surgery of Trauma (AAST). “AAST Organ Injury Scale” is a trademark of its owner and is named here only to refer to the system. Always consult the official source for the exact, current criteria.