Some Wearables Can Track Blood Pressure. Do They Work?

Cuffless wearable blood pressure tracking lacks a validated accuracy standard and can't yet replace clinical cuffs, per the American Heart Association.

• PPG sensing, not direct measurement: Wearables use LED-based photoplethysmography to read pulse waveforms and infer blood pressure, unlike cuffs or invasive arterial needles, the clinical gold standards.
• Five devices tested: WSJ's Nicole Nguyen tested Hilo Core, WHOOP, Oura Ring, Google Pixel, and Apple Watch, each giving different frequency and granularity of blood pressure data.

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