There are times when the your medical care need is not available at your current location and you need to be transferred to a facility that offers just what you need, but cannot do so without having skilled medical management by your side during the move.
Interfaciltiy, also known as Special Care Transport, provides Advanced Life Support and specialized medical monitoring. The ambulance is staffed with both an EMT and a critical care trained Registered Nurse. Some refer to it as a "rolling intensive care unit."