A medical monitoring system has a sensor system including a sensor associated with a patient and a remote monitoring unit. The remote, monitoring unit includes a microprocessor in communication with the sensor system, and a portable-monitoring-unit transceiver system in communication with the microprocessor. The portable-monitoring-unit transceiver system has a land-line telephone transceiver and/or a cellular telephone transceiver, and a third-network transceiver such as a paging-network transceiver. A full data set is transmitted over the land-line telephone transceiver or the cellular telephone transceiver when communications links over these transceivers are available, and a reduced data set is transmitted over the third-network transceiver when communications links over the land-line telephone transceiver and the cellular telephone transceiver are not available.
