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Table 1 NAECC definition of Acute Lung Injury (ALI) and Acute Respiratory Distress Syndrome (ARDS)[1]

From: Biomarkers of acute lung injury: worth their salt?

  Timing Oxygenation Chest Radiograph Exclusion of cardiogenic pulmonary oedema
Acute PaO2/FiO2 ≤ 300 mmHg or 40 kPa
PaO2/FiO2 ≤ 200 mmHg or 27 kPa
Bilateral opacities consistent with pulmonary oedema PAOP ≤ 18 mmHg if measured or no clinical evidence of left atrial hypertension
  1. PaO2/FiO2, arterial partial pressure of oxygen/inspired oxygen fraction; PAOP, pulmonary artery occlusion pressure