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3 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.
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.
95-100% is normal SpO₂ in a healthy adult; ≥95% in children, often 93-97% past 65. Values by age, altitude, and when a reading is an emergency.
