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Behind the walls of Cupertino, a version of the Apple Watch being tested requires users to squeeze the frame with two fingers to send a weak electrical current to the heart to pick up signals, the report said.

Apple is working on expanding the heart monitoring capabilities of future Apple Watches, according to sources cited by Bloomberg.

Apple's Smart Watch Series 3 with the Sport Loop band. Currently, the wearable sports a heart rate monitor that uses photodiode sensors and LEDs to track the flow of blood through the skin. Just last month, it launched its Apple Heart Study app with the goal of determining whether the Apple Watch's existing heart rate system could be used to accurately detect irregular heart rhythms, according to MacRumors.

EKGs, also known as ECGs or electrocardiograms, are a more in-depth method of scoping out your heart's patterns. Apple spokeswoman Amy Bessette declined to comment.

Ethan Weiss, a cardiologist at the University of California, says that even though there is role for wearable EKG devices, there are only recommended for patients who are already displaying symptoms.

By adding an EKG monitor to the Apple Watch, it may become easier to predict arrhythmias as an adjunct to what is now available. Data from the research may help Apple develop artificial intelligence-based tools that can spot abnormalities more easily and support the EKG project. While multiple Apple executives have repeatedly highlighted the health care sector as a target for innovation, the field is of particular interest to chief operating officer Jeff Williams. With a few more years, it's quite likely that the Apple Watch will have a suite of third-party medical companions, transforming its utility with little effort on Apple's end.

On top of that, the health industry is an especially lucrative market to get into-and Apple's all about that, too.