. Author manuscript; available in PMC: 2012 Oct 4.

Published in final edited form as: J Urol. 2011 Dec 15;187(2):536–541. doi: 10.1016/j.juro.2011.09.155

APPENDIX.

AAST Organ Injury Severity Score for Renal Trauma

Grade	Type	Description
I	Contusion	Microscopic or gross hematuria, urological studies normal
I	Hematoma	Subcapsular, nonexpanding without parenchymal laceration
II	Hematoma	Nonexpanding perirenal hematoma confined to renal retroperitoneum
II	Laceration	Parenchymal depth of renal cortex less than 1.0 cm without urinary extravasation
III	Laceration	Parenchymal depth of renal cortex greater than 1.0 cm without collecting system rupture or urinary extravasation
IV	Laceration	Parenchymal laceration extending through renal cortex, medulla and collecting system (positive urine extravasation)
IV	Vascular	Main renal artery or vein injury with contained hemorrhage
V	Laceration	Completely shattered kidney
V	Vascular	Avulsion of renal hilum that devascularizes kidney

Advance 1 grade for bilateral injuries up to grade III.