Norton Scale (Pressure Ulcer Risk)

The Norton Scale is the original and one of the most historically significant pressure ulcer risk assessment tools in nursing practice. Developed by Doreen Norton and colleagues in 1962 in the United Kingdom, it was the first validated tool specifically designed to predict pressure sore risk in hospitalized patients, predating both the Braden and Waterlow scales.

The Norton Scale evaluates five domains: physical condition, mental condition, activity, mobility, and incontinence. Each domain is scored from 1 (worst) to 4 (best), yielding a total score from 5 (highest risk) to 20 (lowest risk). Like the Braden Scale, lower scores indicate higher risk. The simplicity of the five-domain, four-level structure makes it one of the quickest pressure ulcer risk assessments to complete.

Pressure ulcers remain a persistent challenge in healthcare, despite decades of attention and prevention efforts. The Norton Scale was developed during Norton's landmark study of geriatric patients, which demonstrated that pressure sore development could be predicted based on measurable patient characteristics and that systematic risk assessment could guide preventive interventions. This was a revolutionary concept at the time.

The critical threshold on the Norton Scale is a score of 14 or below, which indicates the patient is at risk for pressure ulcer development. Scores of 12-14 indicate moderate risk, while scores at or below 10 indicate very high risk. Norton's original research found that patients scoring 14 or below had a significantly higher incidence of pressure sores compared to those scoring above 14.

The mental condition domain is a distinctive feature of the Norton Scale not found in some other assessment tools. Norton recognized that confused, apathetic, or stuporous patients are at increased risk because they cannot perceive or communicate discomfort from sustained pressure, cannot independently reposition, and may resist care interventions. This domain has been validated as an independent risk factor in subsequent research.

While the Braden Scale has largely superseded the Norton Scale in many settings due to its more detailed subscale definitions and stronger evidence base, the Norton Scale remains widely used, particularly in European healthcare systems and in settings where its simplicity and speed of administration are valued. Some modified versions (Norton Plus, Modified Norton Scale) have been developed to address limitations of the original tool.