PISA Calculator - Patient Information and Safety Assessment

The PISA (Patient Information and Safety Assessment) Calculator is a multi-dimensional tool designed to evaluate patient safety across several critical domains: medication safety, physical status, cognitive function, mobility, communication, and health literacy. By integrating these factors into a composite safety score, healthcare providers can identify patients at elevated risk for adverse events, medication errors, falls, and communication breakdowns — enabling proactive, targeted interventions. Patient safety is one of the most critical concerns in modern healthcare. Each year, millions of patients experience preventable adverse events ranging from medication errors and fall-related injuries to misdiagnosis stemming from communication failures. Traditional approaches to safety assessment often focus on individual risk factors in isolation, such as fall risk scales or medication reconciliation checklists, but fail to capture the complex interactions between multiple risk domains. The PISA framework addresses this limitation by providing a holistic, weighted assessment that reflects the cumulative burden of multiple safety vulnerabilities. The calculator evaluates eight primary safety domains. Vital signs (blood pressure, heart rate, temperature, oxygen saturation) reflect the patient's current physiological stability and may indicate acute illness requiring urgent attention. BMI, derived from height and weight, assesses nutritional status and metabolic risk. Age is incorporated because older patients — particularly those over 65 — face compounded risks from polypharmacy, physiological frailty, and cognitive decline. Medication burden is assessed using the number of concurrent medications, with polypharmacy (typically defined as five or more medications) significantly increasing the risk of adverse drug reactions and drug-drug interactions. Cognitive status is perhaps the most influential predictor of overall safety risk. Patients with cognitive impairment have difficulty understanding treatment instructions, recognizing adverse drug effects, adhering to medication schedules, and communicating symptoms to healthcare providers. Mobility impairment dramatically increases fall risk, a leading cause of injury-related hospitalization in older adults. Communication ability affects every aspect of safe care delivery, from obtaining an accurate history to ensuring informed consent and verifying patient understanding of discharge instructions. Health literacy — the ability to obtain, process, and understand basic health information — is a fundamental but often overlooked determinant of patient safety, with low health literacy strongly associated with medication errors, non-adherence, and unnecessary hospital readmissions. The PISA score is calculated on a 100-point scale, with higher scores indicating greater safety risk. Scores below 25 indicate low risk with standard precautions, 25-49 indicate moderate risk requiring enhanced monitoring, 50-74 indicate high risk requiring comprehensive safety interventions, and scores of 75 or above indicate critical risk requiring immediate multidisciplinary attention. The calculator provides specific, actionable recommendations for each identified risk domain to guide clinical decision-making and safety planning. This tool is intended for educational and screening purposes. Clinical decisions should always integrate the full clinical context, institutional protocols, and the expertise of qualified healthcare professionals. The PISA calculator complements but does not replace comprehensive clinical assessment by trained healthcare providers.