A method for transfer of electrocardiograph data between a remote processor connected to a central processor via a network. Identification information concerning a test subject associated with electrocardiograph data stored on a portable storage medium is entered into a remote processor. The remote processor extracts the electrocardiograph data from the portable storage medium and transmits the identification information and the electrocardiograph data from the remote processor to a central processor. Upon receipt and storage of the electrocardiograph data, the central processor transmits a release message to the remote processor to enable erasure of the electrocardiograph data from the portable storage medium.