Fortunately, technology has come to the rescue! Here are a few "apps" and resources.
Colorino can detect more than 150 different colors and announce them in a clear voice. It offers 3 volume levels as well as an earphone jack to plug in earphones for more privacy. It is small enough to fit in a pocket and is battery operated.
Are there other "apps" available? Are you a nurse who is color blind or have you worked with a nurse who is color blind?