Pneumonia Severity Index calculator and associated risk classes

Risk factorPoints
MenAge (years)
WomenAge (years) – 10
Nursing home resident+10
Liver disease+20
Heart failure+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 classTotal points
 I< 51
 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..