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7 articles on this topic
3.3% is the average gap between wrist SpO₂ and medical-grade fingertip readings at 12,000ft — what to expect, and when to trust a real oximeter instead.
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.
95–100% SpO₂ is normal for a healthy adult at sea level — what the device measures, how it works, and normal values by age and altitude explained.
±2–3% accuracy is the clinical bar (IEC 60601-1) — compare 5 fingertip and wearable models for cold, battery life, and readability above 4,000 m.
5–10 points off is the typical error from cold hands or motion — the 3-step technique for a reliable SpO₂ reading, and how to read the number right.
At 4,000 m SpO₂ falls to 85–90%. At 5,000 m: 75–82%. Full chart every 500 m — from sea level to Everest — with AMS thresholds and descent criteria.
