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Happy Hypoxia: COVID-19 May Cause Dangerously Low Oxygen Levels With Few Other Symptoms
Monitor your blood 02 even in "mild" case: Normal blood oxygen: 95% - 100% Below 92%: cause for concern.
"Incredibly, people with 'happy hypoxia' sometimes even have blood oxygen levels so low as to be 'incompatible with life' but feel no ill effects."