The American Association for the Surgery of Trauma Organ Injury Severity Scale Spleen grading system is as follows:

1. Grade I
   1. Subcapsular hematoma of less than 10% of surface area
   2. Capsular tear of less than 1 cm in depth
2. Grade II
   1.Subcapsular hematoma of 10-50% of surface area
   2. Intraparenchymal hematoma of less than 5 cm in diameter
   3. Laceration of 1-3 cm in depth and not involving trabecular vessels
3. Grade III
   1. Subcapsular hematoma of greater than 50% of surface area or expanding and ruptured subcapsular or parenchymal hematoma
   2. Intraparenchymal hematoma of greater than 5 cm or expanding
   3. Laceration of greater than 3 cm in depth or involving trabecular vessels
4. Grade IV – Laceration involving segmental or hilar vessels with devascularization of more than 25% of the spleen
5. Grade V – Shattered spleen or hilar vascular injury

The American Association for the Surgery of Trauma Organ Injury Severity Scale Liver grading system is as follows:

1. Grade I – Capsular avulsion; periportal blood tracking; superficial laceration less than 1-cm deep; subcapsular hematoma less than 1-cm thickness
2. Grade II – Laceration 1- to 3-cm deep; subcapsular/central hematoma 1- to 3-cm diameter
3. Grade III – Laceration greater than 3-cm deep; subcapsular/central hematoma greater than 3-cm diameter
4. Grade IV – Massive central or subcapsular hematoma greater than 10 cm; lobar tissue maceration or devascularization
5. Grade V – Bilobar tissue maceration or devascularization