watchOS 5.1.2 will contain an Apple-designed ECG app that can indicate if the heart's rhythm shows signs of atrial fibrillation, a severe form of irregular heartbeat or normal sinus rhythm. Apple Watch Series 4 is capable of generating an ECG similar to a single-conductive electrocardiogram, according to the FDA.
ECG and other heart data gather in the Health app on a paired iPhone. Apple's document contains a minimum requirement for an iPhone 5 or later running iOS 1
If you want to take an ECG reading from Apple Watch, users have to put a finger on the digital crown while wearing the clock. The reading is completed in 30 seconds, allowing users to determine if their hearts are in a regular pattern or if there are signs of atrial fibrillation.
Apple's training document indicates that the ECG app is regulated and available only in regions removed for use. The app will initially be limited to the United States, where Apple has received FDA approval, but Apple Watch Series 4 models sold worldwide include the electric heart rate sensor for future expansion.
Apple Store employees are advised to advise customers that the ECG app is not "intended to be a diagnostic device or replace traditional diagnosis methods" and "should not be used to monitor or track disease condition or change medication without first talking to a doctor, "according to Apple's document.
Apple promised that the ECG app will be available later this year, but it is unclear when watchOS 5.1.2 and iOS 12.1.1 are released. watchOS 5.1.2 has been in beta testing since November 7, while iOS 12.1.1 has been in beta testing since October 31, so both software updates should be resolved relatively soon.
A separate Apple Training Document, obtained by MacRumors, suggests that irregular heartbeat alerts will also be enabled in watchOS 5.1.2 on Apple Watch Series 1 through the Apple Watch Series 4 models.
The ECG app will not be available on previous generation Apple Watch models, including the original through Series 3.