National Pressure Ulcer Advisory Panel Staging System (NPUAP)

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1.Clinical Description of Pressure Ulcer
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1. Clinical Description of Pressure Ulcer

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About this Calculator

A pressure ulcer is a localized injury to the skin and/or underlying tissue usually over a bony prominence as a result of pressure, or pressure in combination with shear and/or friction.

The intent of staging is to provide an objective description of the severity of pressure ulcers. The NPUAP Staging System is widely used and was most recently revised in 2007. It is not to be applied to other skin wounds, such as diabetic foot ulcers, or arterial ulcers.

This staging system is not based on the natural history of pressure ulcer development. The stages described are not necessarily based on histopathology or the progression of the pressure ulcers.


National Pressure Ulcer Advisory Panel. Accessed June 6th, 2012.

Frontera W, Delisa J, Gans B, Walsh N, Robinson L.

Delisa's Physical Medicine and Rehabilitation Principles and Practice 5th Edition. Lippincott Williams and Wilkins, Philadelphia, PA. P1398-1399

K Johansen, M Daines, T Howey, D Helfet, S T Hansen

Objective criteria accurately predict amputation following lower extremity trauma.

Journal of Trauma 1990, 30 (5): 568-72; discussion 572-3

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