A system according to one aspect of the present invention comprises a processor, a device interface, a user interface, a data relay transceiver, and a memory coupled to the processor and storing instructions. The processor executes the instructions in the memory to receive data from a medical device through a wired connection using the device interface, and transmits the data to an intermediary device using the data relay transceiver. This system can be implemented in a small, portable unit that is easy for a patient to transport. The system's user interface may include a microphone and speaker to allow the communication of audible information between the system and a user. Aspects of the system can be practiced automatically to allow a medical device for a patient or other subject to be monitored without requiring the patient to manually enter information.