Pneumonia Severity Index PSI Calculator

Age in years

Sex male is one female is zero

Nursing home resident yes is one no is zero

Neoplastic disease yes is one no is zero

Liver disease yes is one no is zero

Congestive heart failure yes is one no is zero

Cerebrovascular disease yes is one no is zero

Renal disease yes is one no is zero

Altered mental status yes is one no is zero

Respiratory rate per minute

Systolic blood pressure mmHg

Temperature in Celsius

Pulse rate per minute

Arterial pH

BUN mg per dL

Sodium mEq per L

Glucose mg per dL

Hematocrit percent

Partial pressure of arterial oxygen mmHg

Pleural effusion yes is one no is zero

Pneumonia Severity Index PSI Explanation and Clinical Context
The PSI is a clinical prediction rule that estimates mortality risk in adults with community acquired pneumonia. It integrates demographic factors comorbid conditions physical findings and laboratory and radiographic data. The total score categorizes patients into five risk groups that correspond to increasing severity and mortality. It assists clinicians in determining whether outpatient or inpatient care is appropriate. Lower classes usually indicate safe outpatient treatment while higher classes signal significant risk and the need for hospital based care. The tool has been widely validated across diverse populations and remains one of the most influential risk stratification systems in pneumonia research and clinical practice.

Reference
Fine MJ et al. N Engl J Med. 1997. Three thousand two hundred eighty seven patients were studied. The PSI remains a landmark study in pneumonia risk assessment.

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