Smart Wearables
Blood Oxygen (SpO2) Tracking: Sensor Accuracy and Regulatory Considerations
SpO2 tracking is a popular wearable feature, but marketing it responsibly requires understanding both its accuracy limits and regulatory boundaries.
Published 2026-04-14 · Smart Wearables
How Wearable SpO2 Sensing Works
Wearable SpO2 estimates use the same PPG-based light absorption principle as heart rate sensing, comparing light absorption at two wavelengths to estimate blood oxygen saturation — generally less precise than dedicated medical pulse oximeters.
The Wellness vs. Medical Device Distinction
Marketing SpO2 features as general wellness insight (not diagnostic medical information) is standard industry practice and avoids triggering medical device regulatory requirements — a positioning distinction worth maintaining carefully in your marketing copy.
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