. Author manuscript; available in PMC: 2013 Aug 27.

Published in final edited form as: J Urol. 2012 May 15;188(1):163–168. doi: 10.1016/j.juro.2012.03.003

APPENDIX.

The AAST Organ Injury Severity Scale for Kidney¹⁶

Grade	Type	Description
1	Contusion	Microscopic or gross hematuria, urological studies normal
	Hematoma	Subcapsular, not expanding with no parenchymal laceration
2	Hematoma	Nonexpanding perirenal hematoma confined to renal retroperitoneum
	Laceration	Less than 1.0 cm parenchymal depth of renal cortex with no urinary extravasation
3	Laceration	Greater than 1.0 cm parenchymal depth of renal cortex with no collecting system rupture or urinary extravasation
4	Laceration	Parenchymal laceration extending through renal cortex, medulla and collecting system
	Vascular	Main renal artery or vein injury with contained hemorrhage
5	Laceration	Completely shattered kidney
	Vascular	Avulsion of renal hilum which devascularizes kidney