A modular self-care health monitoring system employs a compact microprocessor-based unit such as a video game system of the type that includes switches for controlling device operation and a program cartridge. In accordance with the invention, the program cartridge adapts the microprocessor-based unit for operation with a glucose monitor (or another type of health monitor). The microprocessor-based unit processes data supplied by the glucose monitor to supply signals for displaying relevant information on a display unit that may be included in the microprocessor-based unit or may be a separate unit such as a television or video display monitor. The system provides for transmission of signals to a remote clearinghouse or a healthcare facility via telephone lines or other transmission media. The clearinghouse includes signal processing capability for transmission of reports to a remotely located healthcare professional via facsimile transmission.