what is a code blue in the hospital
code blue. Code Emergency medicine A message announced over a hospital's public address system, indicating that a cardiac arrest requiring CPR is in progress; to be 'coded' is to undergo CPR. code blue.
Code Red and Code Blue are both terms that are often used to refer to a cardiopulmonary arrest, but other types of emergencies (for example bomb threats, terrorist activity, child abductions, or mass casualties) may be given code designations, too.