<prompt> Diagnostic criteria for ARDS include all exceptBilateral alveolar infiltratesPaO2 FiO2 300 mm HgAcute onsetPulmonary capillary wedge pressure 18 mm Hg  <response>: Diagnostic Criteria for ARDSSeverity: OxygenationMild: Pao2Fio2 300-2 00 mmHgModerate: Pao2Fio2 200-100 mmHgSevere: Pao2Fio2 100 mmHgOnsetAcuteChest RadiographBilateral alveolar or interstitial infiltratesAbsence of Left Atrial HypeensionPCWP 18 mmHg or no clinical evidence of increased left atrial pressureRef: Harrison 19e pg: 1736 