Apple and Stanford are launching a joint study to research irregular heart rhythms using the Apple Watch. The study was first announced back in September and kicks off today.

Apple Heart Study is available to download from the App Store in the United States starting today. Apple Watch also saw the first FDA-approved accessory with an EKG reader which further advances its role in the health space.

Full app description below:

– AFib is one of the most common forms of irregular heart rhythm. It can lead to blood clots or heart failure and is a leading cause of stroke. AFib affects tens of millions of people — but many of those people don’t experience symptoms, so it often goes undiagnosed.

– The Apple Heart Study uses an app designed to notify participants if an irregular heart rhythm is observed.

– The app will passively monitor your heart rate along with your heart rhythm. If an irregular heart rhythm is observed, the app will notify you.

– After the notification, you’ll receive a free video consultation on your iPhone with the study’s medical professionals for further analysis.

– The video consultation connects you with a board-certified, licensed primary care provider from American Well – 24 hours a day, 7 days a week.

– In some cases, the doctor may recommend a BioTelemetry electrocardiogram (ECG) patch for additional monitoring. The patch will be mailed to you at no cost and should be worn for seven days. The ECG data gathered over this period will be used to determine whether AFib or another type of irregular heart rhythm is present.

– Participation in the Apple Heart Study is voluntary. After you download the app, you’ll be asked to give your consent for participation. The heart rate sensor data you provide over time will be collected by Stanford Medicine and Apple for research analysis. Apple will not have access to any information that can directly identify you.