The American Association for the Surgery of Trauma (AAST) Liver Injury Grade Does Not Equally Predict Interventions in Blunt and Penetrating Trauma. The AAST liver injury grade has a validated association with mortality and need for operation. AAST liver injury grade is the same regardless of the mechanism of trauma. A 5-year retrospective review of all liver injuries at an urban, level-one % for all grades). In penetrating trauma, AAST grade was associated with need for angiography (7%, 4%, 15%, 24%, 30%, p < 0.01) and percutaneous drainage (7%, 2%, 14%, 18%, 26%, p = 0.03) and had a marginal association with embolization (0%, 4%, 11%, 13%, 22%, p = 0.06). Laparotomy, ERCP, sphincterotomy, and stenting rates increased with AAST grade, but this was not statistically significant. AAST grade