Table 2B

Alternative oxygenation criteria (if PaO2 data unavailable)

CriteriaMild ARDSModerate ARDSSevere ARDS
Oxygenation235<SpO2/FiO2≤315
PEEP or CPAP ≥5 cm H2O
150<SpO2/FiO2≤235
PEEP ≥5 cm H2O
SpO2/FiO2≤150
PEEP ≥5 cm H2O
  • ARDS, acute respiratory distress syndrome; CPAP, continuous positive airway pressure; FiO2, fractional inspired oxygen; PaO2, arterial oxygen tension; SpO2, pulse oximetry oxygen saturation; PEEP, positive end-expiratory pressure.