thats more along the lines of how you are triaged by EMS.
black- dead
red- heart attack, stroke, multiple system trauma threathning your life.
yellow- could quickly become a red
green- everything else
in the ER, a different system is used. you are grouped by both the amount of resources you will use, and the severity of your case. its called an ESI level, or emergency severity index. it is used at most hospitals, unc and chatham included.
level 1- someone is pumping your chest
level 2- someone might very soon be pumping on your chest
level 3- belly pain, could need things such a abdominal imaging, labs, etc. someone who might have a spare rib hanging outta their leg.
level 4- someone who is just a little sicker than those who are not sick at all(most cases)
level 5- someone who has no business at the ER
this is a link to a very good tool to describe to the layman the meaning of triage, and how ESI works.
http://www.saem.org/meetings/03handouts/eitel.pdf