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Because a PaO2 level of 90 or 80 mm Hg is still a good level to be at, while both 50 and 40 mm Hg both indicate moderate hypoxemia. It's even more critical because at 50 mm Hg, the body is already lacking oxygen, if the level decreases further to 40 mm Hg it's even further stressed and is borderline severe hypoxemia.

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Q: Why is a drop of PaO2 from 90 mm Hg to 80 mm Hg less critical than from 50 mm Hg to 40 mm Hg?
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