So I'm fairly new to the EMT world now and I have just one thing that's really confused me up to this point. I hear a lot of medics and EMTs here refer to some calls as "cores", and I've at least gathered this basically means a serious call where the patient is critical, but I don't know the specifics or what would qualify a call to be called a core. We simply never heard this terminology used in class or anywhere else. Can anyone give me some info on it? I'm in Colorado if that's a factor.