Code Blue, Code Red, Code Black: Definition of Hospital Color Codes. Medically reviewed by Suzanne Falck, M.D., FACP — Written by Megan Dix, RN, BSN — Updated on April 14, 2023.

When animals are found missing from their enclosures, the zoo triggers different safety codes, depending on the situation’s level of concern: a code red and a code blue, said spokeswoman Kari ...