Tag
7 articles on this topic
3 ways to estimate oxygen saturation without a pulse oximeter: smartwatch, clinical signs, altitude calculator. When to trust each, when not to.
300–500m of descent raises SpO₂ faster than anything else — breathing techniques, rest strategies, and acclimatization schedules that actually help.
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 8,848 m only 31% of sea-level oxygen is available. Discover the data on partial pressure, climbers' SpO₂ readings, and why the Death Zone is lethal.
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.
