Version June 2024
| AAST grade | Description | Clinical criteria | Imaging criteria (CT findings) | Operative criteria | Pathologic criteria |
| I | Infection involving skin only | One or more of the following: peri-incisional erythema, warmth, pain, swelling without induration, exudate, or wound separation | N/A | N/A | N/A |
| II | Infection involving subcutaneous tissue | One or more of the following: peri-incisional erythema, warmth, pain, swelling plus induration, or exudate confined to subcutaneous tissues | Soft tissue inflammatory changes, phlegmon or abscess in subcutaneous tissues | Phlegmon or abscess in subcutaneous tissues | Acute inflammation limited to subcutaneous tissues |
| III | Infection involving fascia or muscle layer | Subcutaneous abscess or phlegmon extending to muscle or fascia | Regional soft tissue inflammatory changes, phlegmon, or abscess involving muscle or fascia | Phlegmon or abscess involving muscle or fascia | Acute inflammation involving muscle or fascia with cultures positive for organism if available |
| IV | Infection involving body cavity or deep space that was opened or manipulated during the surgery | Above, plus separation of fascia or subfascial abscess | Phlegmon or abscess extending deep to muscle or fascia or fascial dehiscence at surgical site | Phlegmon or abscess extending deep to muscle or fascia or fascial wound dehiscence | Acute inflammation involving fascia and underlying tissues with cultures positive for organism if available |
| V | Infection involving body cavity or deep space away from the site that was opened or manipulated during surgery | Purulent drainage in a body cavity away from the operative site | Phlegmon or abscess in body cavity or deep space extending deeper than the fascia/deep muscle incision | Phlegmon or abscess in body cavity or deep space extending deeper than the fascial/deep muscle incision | Acute inflammation in body cavity or deep space extending deeper than the fascial/deep muscle incision with cultures positive for organisms if available |
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