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69% of sea-level oxygen remains at 10,000ft — enter any elevation for O₂% and expected SpO₂, from Colorado trails to Everest base camp.
88–92% SpO₂ is normal at 3,500m — what a falling reading means, which numbers should worry you, and why the device is an early warning, not a diagnosis.
At 3,000 m only 69% of sea-level oxygen is left; at 5,000 m, 53%. Full percentage chart by elevation with air pressure in hPa, on the ISA model.
