Waterlow Pressure Ulcer Risk

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Evaluate Pressure Ulcer Risk With the Waterlow Score

Pressure ulcers are among the most preventable complications in healthcare, yet they remain distressingly common in hospitals, nursing homes, and community care settings. The Waterlow Pressure Ulcer Risk assessment tool implements the Waterlow score - one of the most widely used pressure injury risk assessment scales in the United Kingdom, Australia, and many other countries. By identifying high-risk patients early, nurses can implement preventive measures before skin breakdown occurs.

Developed by Judy Waterlow in 1985 and revised multiple times since, the Waterlow score considers a broader range of risk factors than many competing scales. It evaluates patient characteristics, clinical conditions, and medication factors that contribute to pressure injury development, producing a total score that guides the level of preventive intervention required.

How to Calculate the Waterlow Score

Assess each risk category and enter the appropriate score. Build/weight for height: ranges from 0 (average) to 3 (above average or obese). Skin type: 0 (healthy) to 3 (broken, with additional points for dry, papery, or oedematous skin). Sex and age: scored together based on age brackets with additional points for males over 14. Continence: 0 (continent) to 3 (doubly incontinent). Mobility: 0 (fully mobile) to 5 (chairbound or bedbound).

Additional special risk factors include tissue malnutrition (cachexia, anaemia), neurological deficit, major surgery or trauma, and medication (steroids, cytotoxics, anti-inflammatory drugs). The tool sums all components and categorises risk as at risk (10-14), high risk (15-19), or very high risk (20+).

Who Uses the Waterlow Score?

Ward nurses perform Waterlow assessments on admission and at regular intervals thereafter - it is a mandatory assessment in many healthcare organisations. Tissue viability nurses use it to prioritise their caseload and allocate pressure-relieving equipment. Community nurses assess housebound patients, particularly the elderly and those with reduced mobility. Care home staff use it as part of routine resident assessment.

The Waterlow Pressure Ulcer Risk calculator is also used in clinical audits and quality improvement programmes, where pressure ulcer incidence is tracked against the adequacy of risk assessment documentation.

From Score to Action

The real value of the Waterlow score lies in what happens after it is calculated. At-risk patients should receive a pressure area care plan including regular repositioning, skin inspection, and appropriate support surfaces. High-risk patients need pressure-relieving mattresses, more frequent repositioning schedules, and nutritional assessment. Very high-risk patients require the most intensive prevention strategies including specialist dynamic mattresses, careful manual handling plans, and daily skin assessment.

Best Practice Reminders

Reassess the Waterlow score whenever a patient's condition changes - post-surgery, after a fall, on developing acute illness, or when mobility deteriorates. Document not just the score but the interventions implemented in response. Remember that the Waterlow scale tends to over-predict risk (high sensitivity, lower specificity), meaning some patients flagged as high risk may not develop ulcers. This is acceptable - the cost of prevention is far lower than the cost of treating an established pressure ulcer, both in terms of patient suffering and healthcare resources.