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Home > Articles > Organ Injury Scaling - Kidney

AAST Organ Injury Scale Scores for the Kidney - matched to AIS-90 codes. Use Abbreviated Injury Scale Scores (AIS) for Injury Severity Scoring (ISS).

Grade Injury Description AIS-90
I Contusion Microscopic or gross haematuria, urological studies normal 2
Haematoma Subcapsular, nonexapnding without parenchymal laceration 2
II Haematoma Nonexpanding perirenal haematoma confined to renal retroperitoneum 2
Laceration <1cm parenchymal depth of renal cortex without urinary extravasation 2
III Laceration >1cm depth of renal cortex, without collecting system rupture or urinary extravasation 3
IV Laceration Parenchymal laceration extending through the renal cortex, medulla and collecting system 4
Vascular Main renal artery or vein injury with contained haemorrhage 5
V Laceration Completely shattered kidney 5
Vascular Avulsion of renal hilum which devascularises kidney 5
Advance one grade for multiple injuries to same organ.


  1. Santucci RA, McAninch JW, Safir M et al. Validation of the American Association for the Surgery of Trauma organ injury severity scale for the kidney. J Trauma. 2001 Feb;50(2):195-200.


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