1. Mainly no, but our safety protocols say that in case of emergency (like train out of track, several patients coming, war, gas leak etc.) we need to call a supervisor, so I assume we will catch one if we need. We have their personal numbers in our protocols. 2. If we need to call, we just start calling in the order in the protocol and hope someone will answer. 3. They are basically not "in charge". We tend to handle most of the things by ourselves and there haven't been any issue I know that supervisor needed to be alerted. Although if they are they will be compensated. 4. Yes we do and we have all their numbers in case of emergency and also our lab supervisors supervisor numbers as well as the head of the department (doctor). 5. In the department I work there are maybe 300 BLS (phleb, microb, pathology, chem, hemat). Our company has also two other departments that are smaller.