AAST Organ Injury Scale (spleen/liver/kidney)
AAST organ-injury grade (2018 revision): the I-V spleen/liver/kidney injury grade set by the anatomic finding or the vascular-injury rule, whichever is higher.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Organ
- Spleen
- Anatomic finding grade
- 2
- Vascular injury / active bleeding
- Vascular injury / active bleeding contained within the organ
Result: AAST Spleen injury grade IV (I-V), set by the 2018 vascular-injury rule: anatomic finding (grade II): Subcapsular hematoma 10-50%; intraparenchymal hematoma < 5 cm; laceration 1-3 cm depth; vascular injury / active bleeding contained within the spleen (grade IV).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Grades
- spleen/liver/kidney trauma I-V by hematoma extent, intraparenchymal size, and laceration depth (imaging column).
- 2018 vascular rule
- a vascular injury or active bleeding contained within the organ raises the grade (spleen IV, liver/kidney III); active bleeding extending beyond raises it one higher (spleen V, liver/kidney IV).
What you enter
- Organ
- Anatomic finding grade (1-5)
- Vascular injury / active bleeding
How this is calculated
Kozar RA, Crandall M, Shanmuganathan K, et al; AAST Patient Assessment Committee. Organ injury scaling 2018 update: spleen, liver, and kidney. J Trauma Acute Care Surg. 2018;85(6):1119-1122. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.