Having also worked the medical side of the street....what's the difference between this and "code blue, code blue, 304" in a hospital?? Note: 'code blue' refers to the patient in room 304 has gone into cardiac / respiratory arrest...at least in the States.
This code means that the nurses / doctors / residents / other specialists on duty or on call haul @ss to room 304, and what to expect when they arrive there.