Wearable Health Sensors: What They Can Actually Detect Today
Wearable health sensors keep adding new claimed capabilities. Here's a grounded look at what they can genuinely detect.
Consumer wearable devices can now reliably track heart rate, sleep patterns, and blood oxygen levels with reasonable accuracy, capabilities that have moved from specialized medical equipment into everyday mainstream devices.
What's genuinely reliable today
Heart rate and general activity tracking are quite accurate and well validated at this point, and irregular heart rhythm detection features have demonstrated real, clinically meaningful accuracy in formal studies across several devices.
Where claims still outpace the actual evidence
Some marketed features, like stress level estimates or certain specific health condition predictions, rely on indirect signals and haven't been validated with the same rigor as heart rate or rhythm detection, meaning they're worth treating as a rough general indicator rather than a genuine diagnostic tool.