The Norton Scale is a scoring tool used in healthcare to predict a patient’s risk of developing pressure ulcers, commonly known as bedsores. Developed in 1962 by Doreen Norton and colleagues during a study of geriatric nursing problems in British hospitals, it was one of the first standardized methods for identifying which patients were most vulnerable to skin breakdown. Scores range from 5 to 20, with 14 or below signaling high risk.
What the Scale Measures
The Norton Scale evaluates five categories, each scored from 1 (worst) to 4 (best):
- Physical condition: The patient’s overall health, from good to very poor.
- Mental status: Alertness and orientation, ranging from fully alert to unresponsive.
- Activity level: Whether the patient walks independently, needs assistance, is chair-bound, or is confined to bed.
- Mobility: How freely the patient can reposition their body, from full movement to completely immobile.
- Continence: Bladder and bowel control, from fully continent to incontinent of both.
A nurse or other healthcare provider rates each category, then adds the five numbers together. The lowest possible score is 5 (highest risk), and the highest is 20 (lowest risk). The scale is intentionally simple, designed to be completed in just a few minutes at the bedside without any special equipment or lab work.
How Scores Translate to Risk
The critical threshold is 14. A score of 14 or below indicates high risk for pressure ulcers and typically triggers a prevention plan, such as more frequent repositioning, specialized mattresses, or closer skin monitoring. A score of 15 or above suggests lower risk, though it doesn’t mean the patient is immune to skin breakdown.
That cutoff point matters because it shapes the sensitivity of the tool. At a score of 14, the Norton Scale correctly identifies roughly 68% of patients who go on to develop a pressure ulcer. Raising the cutoff to 15 catches about 77% of at-risk patients, but at the cost of flagging more people who never actually develop one. In practice, some facilities adjust the cutoff depending on their patient population and the resources available for prevention.
Where It’s Used
The Norton Scale was originally designed for elderly hospital patients, and that remains its strongest use case. It’s commonly applied in geriatric wards, long-term care facilities, and rehabilitation settings where patients may spend extended periods in bed or in a wheelchair. Its simplicity makes it especially useful in busy clinical environments where nurses need a quick, consistent way to screen large numbers of patients.
It is not well suited for every situation. The scale was not designed to assess the risk of device-related pressure injuries, the kind caused by oxygen masks, casts, or medical tubing pressing against the skin. For surgical patients or those in intensive care, other tools may capture relevant risk factors that the Norton Scale misses entirely.
How It Compares to the Braden Scale
The Braden Scale, introduced in 1987, is the other widely used pressure ulcer risk tool. It assesses six categories instead of five: sensory perception, moisture, activity, mobility, nutrition, and friction/shear. While the Norton Scale focuses on general physical and mental condition, the Braden Scale zeroes in on specific mechanical and nutritional factors that contribute to skin breakdown.
In a study of surgical patients, the Braden Scale (at a cutoff of 16) achieved 100% sensitivity, meaning it caught every patient who developed a pressure ulcer. The Norton Scale at its standard cutoff of 14 caught 83.3%. However, both scales had relatively low positive predictive values, around 17 to 19%, meaning most patients flagged as high risk never actually developed an ulcer. This is a common trade-off in screening tools: casting a wide net catches more true cases but also generates many false alarms.
Neither scale is clearly superior across all settings. The Braden Scale is more commonly used in the United States, while the Norton Scale remains popular in parts of Europe and in geriatric-focused care.
Known Limitations
The biggest practical problem with the Norton Scale is inconsistency between raters. Two nurses evaluating the same patient can arrive at different scores, particularly for subjective categories like “physical condition” and “mental status.” This poor interrater reliability means that a patient’s risk classification can shift depending on who conducts the assessment, which creates gaps in care continuity.
There’s also a broader question about whether any standardized scale outperforms experienced clinical judgment. A Cochrane review of randomized controlled trials found that using the Norton Scale, the Braden Scale, or similar tools was no more effective at reducing pressure ulcer rates than relying on a nurse’s own assessment, or using these scales alongside targeted prevention training. The scales remain standard practice in most healthcare facilities because they provide documentation and a shared language for care teams, but they work best as one input among many rather than as a standalone decision-making tool.
The scale also lacks granularity for certain risk factors that modern research has identified as important, including nutritional status, skin moisture, and the specific friction forces acting on vulnerable areas. Modified versions of the Norton Scale exist that add categories like food intake and fluid intake, though these variants are less widely validated than the original.