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. 2016 Mar 15;4(1):47–53. doi: 10.14218/JCTH.2015.00044

Table 2. Staging of HPS (The European Respiratory Society Task Force in 2004)1.

Mild PaO2 ≥ 80 mm Hg
Moderate PaO2 60–79 mm Hg
Severe PaO2 50–59 mm Hg
Very severe PaO2 < 50 mm Hg