The American Association for the Study of Trauma has classified small bowel injury into five grades depending on severity and degree of devascularization. They are:
Grade 1 – partial bowel wall thickness laceration or contusion/hematoma without devascularization
Grade 2 – Less than 50% circumferential full-thickness laceration
Grade 3 – Greater than 50% circumferential full-thickness laceration but without complete transection
Grade 4 – Complete transection of bowel
Grade 5 – Transection accompanied by segmental loss or with devascularization of a segment of bowel
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