Feature

Blood Oxygen Monitoring

Monitoring of peripheral blood oxygen saturation (SpO2), measuring the percentage of hemoglobin carrying oxygen. Normal SpO2 ranges from 95-100% at sea level; values below 90% indicate hypoxemia requiring medical attention. Wearables offer either continuous background monitoring or on-demand spot checks. Continuous overnight SpO2 monitoring can screen for sleep-disordered breathing patterns suggestive of sleep apnea—characterized by repetitive oxygen desaturation events. SpO2 tracking gained prominence during COVID-19 as respiratory deterioration indicator. Accuracy limitations exist: wearable SpO2 is less accurate than medical pulse oximeters, particularly at lower saturation levels, in users with darker skin pigmentation, during motion, or with poor peripheral perfusion. Most wearable SpO2 features are classified as wellness tools rather than medical devices and should not replace clinical pulse oximetry for medical decisions. Persistent low readings warrant professional evaluation.

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