How to Set Up & Use the ECG Feature on Your Apple Watch
By Hallei Halter
The new Apple Watch ECG app works with your Apple Watch Series 4 to read your heart's rhythm and detect any irregularities that might indicate atrial fibrillation (AFib), while letting you take note of any additional symptoms you want to record. To use the ECG app, your Apple Watch Series 4 with watchOS 5.1.2 or later needs to be paired with iPhone 5s or later with iOS 12.1.1 or later. Older Apple Watches do not have this feature.