What Smartwatch ECG Can and Cannot Do
ECG (electrocardiogram) on smartwatches detects atrial fibrillation (AFib), an irregular heart rhythm that can lead to stroke. However, it cannot detect heart attacks or other conditions.
Apple Watch Series 10
Apple's ECG app is FDA-cleared and available in 50+ countries. The single-lead ECG takes 30 seconds and generates a PDF you can share with your doctor.
Samsung Galaxy Watch 7
Samsung's ECG requires the Samsung Health Monitor app and a paired Galaxy phone. It also measures blood pressure when calibrated with a traditional cuff.
Fitbit Sense 3
Fitbit's ECG assesses heart rhythm and provides an AFib detection result. The EDA stress scan complements ECG by tracking electrodermal activity.
Accuracy Comparison
Studies show 98%+ sensitivity for AFib detection across all three platforms. The key difference is ecosystem lock-in and companion app quality.
Who Should Use ECG?
- Adults over 40 with family history of heart conditions
- People experiencing occasional palpitations
- Anyone wanting proactive heart health monitoring
Consult your doctor before relying on smartwatch ECG for medical decisions.
