Version June 2024
| Temperature |
| ≥36.5 or ≤38.4 = 0 point |
| ≥38.5 or ≤38.9 = 1 point |
| ≥39 or <36.5 = 2 points |
| Blood leukocytes, microL |
| ≥4000 or ≤11,000 = 0 points |
| <4000 or >11,000 = 1 point |
| Band forms ≥50 percent = add 1 point |
| Tracheal secretions |
| Absence of tracheal secretions = 0 point |
| Presence of nonpurulent tracheal secretions = 1 point |
| Presence of purulent tracheal secretions = 2 points |
| Oxygenation |
| PaO2/FIO2, mmHg >240 or ARDS (defined as PaO2/FIO2 ≤200, PAWP ≤18 mmHg and acute bilateral infiltrates) = 0 points |
| PaO2/FIO2 ≤240 and no ARDS = 2 points |
| Pulmonary radiography |
| No infiltrate = 0 point |
| Diffuse (patchy) infiltrate = 1 point |
| Localized infiltrate = 2 points |
| Progression of pulmonary infiltrate |
| No radiographic progression = 0 point |
| Radiographic progression (after HF and ARDS excluded) = 2 points |
| Culture of tracheal aspirate |
| Pathogenic bacteria cultured in rare or few quantities or no growth = 0 point |
| Pathogenic bacteria cultured in moderate or heavy quantity = 1 point |
| Same pathogenic bacteria seen on Gram stain, add 1 point |
| Total (a score of >6 was considered suggestive of pneumonia) |
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