Findings that suggest a patient has acute respiratory distress syndrome include a PaO₂/FiO₂ of:

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A PaO₂/FiO₂ ratio less than 200 suggests the presence of acute respiratory distress syndrome, which is a severe lung condition characterized by low oxygen levels, shortness of breath, and difficulty breathing. A ratio between 200-300 indicates mild to moderate acute respiratory distress syndrome. Ratios greater than 300 suggest normal lung function.

Findings That Suggest a Patient Has Acute Respiratory Distress Syndrome