Apple Watch - heart sensor

Cardiogram study: Apple Watch can detect diabetes with an 85% accuracy

Researchers used data from 14,000 Apple Watch users and was able to detect that 462 of them had diabetes by using the Watch's heart rate sensor.
abnormal heart rhythm

Apple Watch could be used to detect an abnormal heart rhythm with 97% accuracy

The study began last year to discover whether the Apple Watch could detect an oncoming stroke, quarter of which are caused by an abnormal heart rhythm.