Based Arrhythmia Detection Technical and Feature Description Apple Watch has an optical heart sensor that uses green LED lights paired with light-sensitive ...
https://www.apple.com/ca/healthcare/docs/site/Apple_Watch_Arrhythmia_Detection.pdf
, and uses Core ML models to analyze the hemoglobin on each one. The app then displays the total estimated blood loss, the estimated hemoglobin loss and a r...