A cardiac health assessment system and method for use with a handheld electronic device. The cardiac health assessment system includes an electronic device case (EDC), a plurality of electrodes, and a circuit board. The EDC secures the handheld electronic device. The electrodes include a first ECG electrode, a second ECG electrode, and a third electrode. The first ECG electrode is placed on an outer surface of the EDC. The second ECG electrode and the third electrode are placed on each side of the EDC to facilitate a thumb and fingers of a user to be placed on the handheld electronic device. The electrodes capture data indicative of the cardiac health of the user. The circuit board includes a microphonic sensor, an Inertial Measurement Unit (IMU) sensor, and a microcontroller. The microphonic sensor and IMU sensor capture cardiac health data. The microcontroller transmits cardiac health data to the handheld electronic device.