UC San Diego engineers develop smart ring that measures biometric markers from sweat

Summary

Engineers at UC San Diego introduced a smart ring in a study published in Nature Communications that continuously collects sweat samples without requiring exercise-induced sweating and measures six biomarkers: glucose, ketones, lactate, alcohol, vitamin C, and uric acid. The device utilizes osmotic hydrogel.

Why it matters

Commercial smart rings can only track biophysical signals such as sleep and heart rate, leaving a gap in molecular-level health monitoring. For diabetic patients, simultaneous glucose and ketone tracking with a single simple ring could replace multiple devices and reduce the negative perception associated with visible medical devices. The osmotic sampling method also enables continuous monitoring for sedentary or immobilized users who cannot reliably produce sweat through movement.

Highlights

• Osmotic hydrogel sampling eliminates the need to exercise to produce sweat, enabling passive 24/7 monitoring.
• The study was validated against continuous glucose monitoring systems (CGM) and commercial ketone meters, achieving 12-hour continuous sessions and two-month calibration stability.
• Simultaneous glucose and ketone readings are positioned as a tool to optimize insulin dosing in diabetes management.

Critical take

The article reads like a lightly edited press release. There is no information provided regarding sample size, statistical significance, or trials conducted under real-world, non-laboratory conditions. A 12-hour monitoring window is quite limited for a device marketed as 'continuous.' The requirement for two-monthly calibration also points to long-term drift that the article glosses over, raising questions about reliability outside of controlled environments.