AASTKidney Injury ScalePatient Education GuideHighest Finding (Imaging/OR)IContusion (hematuria) OR Subcapsular hematoma (no laceration)IIPerirenal hematoma OR Laceration <1 cm parenchyma depth (no extravasation)IIILaceration >1 cm parenchymal depth (no extravasation or collecting system injury)IVLaceration involving collecting system OR Segmental vascular injuryVShattered kidney OR Main renal hilum avulsion/thrombosisDetermine GradeKidney Injury GradingSelect the highest radiologic or operative finding to determine the AAST severity grade.Guidelines & EvidenceWhen to UseHow it WorksClinical PearlsNext StepsThe EvidenceSection 1When to UseSection 2How it WorksSection 3Clinical PearlsSection 4Next StepsSection 5The EvidenceVerifiedLast Review: 2026When to UseWhen to UseBlunt abdominal or flank trauma with suspected renal injury (MVC, falls, assault)Penetrating trauma (stab wounds, gunshot wounds) involving retroperitoneumHematuria (gross or microscopic) following traumaFlank pain, ecchymosis, or rib fractures (11th–12th ribs)CT imaging showing renal parenchymal or vascular injuryIntraoperative identification of renal injuryClinical UtilityGuides non-operative vs operative management decisionsDetermines need for angioembolization in active bleedingPredicts complications such as urinoma, hypertension, and renal lossStandardizes communication across trauma teamsSupports trauma registry reporting and researchComparison with Related ToolsToolFocusUse CaseLimitationAAST Kidney ScaleAnatomic injury gradingRenal trauma managementNo physiologic dataISSOverall injury burdenPrognosisNon-specific to kidneyShock IndexHemodynamicsEarly instability detectionNot organ-specificAAST Vascular ScaleVascular injury detailAdjunct in vascular traumaSeparate classificationLimitationsDoes not incorporate hemodynamic statusLimited predictive value in polytraumaInter-observer variability in CT gradingDoes not directly account for pre-existing renal diseaseLast Comprehensive Review: 2026