Version May 2024
| Stage | Description |
| 1 | Skin intact but with non-blanchable redness for >1 hour after relief of pressure. |
| 2 | Blister or other break in the dermis with partial thickness skin loss, with or without infection. Subcutaneous fat is not visible. |
| 3 | Full-thickness skin loss, with or without infection. Subcutaneous fat may be visible. Undermining and tunneling may be present. |
| 4 | Full-thickness skin and tissue loss with exposed or directly palpable fascia, muscle, tendon, ligament, cartilage, or bone, with or without infection. Often includes undermining and tunneling. |
| Unstageable | Full-thickness skin and tissue loss in which the base of the ulcer is covered by slough and/or eschar in the wound bed. |
| Deep tissue pressure injury | Localized persistent, non-blanchable purple or maroon discolored, but intact skin or blood-filled blister. Due to damage of underlying tissue from prolonged pressure or shear at the bone-muscle interface. |
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