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The Abbott device identifier represents the identifier for the cgm transmitter. If the sensor is swapped but the transmitter remains the same, then the device identifier is not changed. In this case, the new_sensor boolean will be the only way for you to determine that a sensor swap has occurred. If the transmitter is changed, then the device identifier is changed. The device identifier is included in the sources object of the cgm record in the Validic Inform API.