Pneumonia Severity Index calculator and associated risk classes
| Risk factor | Points | |
|---|---|---|
| Demographics | ||
| Men | Age (years) | |
| Women | Age (years) – 10 | |
| Nursing home resident | +10 | |
| Comorbidities | ||
| Neoplasm | +30 | |
| Liver disease | +20 | |
| Heart failure | +10 | |
| Stroke | +10 | |
| Renal failure | +10 | |
| Physical examination findings | ||
| Altered mental status | +20 | |
| Respiratory rate > 30 breaths per minute | +20 | |
| Systolic blood pressure < 90 mm Hg | +20 | |
| Temperature < 95°F or > 104°F | +15 | |
| Heart rate > 125 beats per minute | +10 | |
| Laboratory and radiographic findings | ||
| Arterial pH < 7.35 | +30 | |
| Blood urea nitrogen > 30 mg/dL | +20 | |
| Sodium < 130 mmol/L | +20 | |
| Glucose > 250 mg/dL | +10 | |
| Hematocrit < 30% | +10 | |
| Partial pressure of arterial oxygen < 60 mm Hg | +10 | |
| Pleural effusion | +10 | |
| Risk class | Total points | |
| I | < 51 | |
| II | 51–70 | |
| III | 71–90 | |
| IV | 91–130 | |
| V | > 130 | |
From Fine MJ, Auble TE, Yealy DM, et al. A prediction rule to identify low-risk patients with community-acquired pneumonia. N Engl J Med 1997; 336(4):243–250. Copyright 1997, Massachusetts Medical Society. Reprinted with permission from the Massachusetts Medical Society..