Pneumonia Severity Index Step 2: Risk factors and assigned points

Risk factors	Points
Demographic factors
Age for a man	Age (in years)
Age for a woman	Age (in years) - 10
Nursing home resident	+10
Coexisting illnesses
Neoplastic disease (active)	+30
Chronic liver disease	+20
Heart failure	+10
Cerebrovascular disease	+10
Chronic renal disease	+10
Physical examination findings
Altered mental status	+20
Respiratory rate ≥30/minute	+20
Systolic blood pressure <90 mmHg	+20
Temperature <35°C or ≥40°C	+15
Pulse ≥125 beats/minute	+10
Laboratory and radiographic findings
Arterial pH <7.35	+30
Blood urea nitrogen ≥30 mg/dL (11 mmol/L)	+20
Sodium <130 mmol/L	+20
Glucose ≥250 mg/dL (14 mmol/L)	+10
Hematocrit <30%	+10
Partial pressure of arterial oxygen <60 mmHg*	+10
Pleural effusion on chest radiograph	+10

* Or an oxygen saturation of <90% on pulse oximetry.

Adapted 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; 336:243.

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Pneumonia Severity Index Step 2: Risk factors and assigned points