She told me to go in and take vitals, I think she was doing something else at the time or she would have seen me placing the cuff on that arm. She saw it later before I had removed it. She told me that the pink armband thing was universal. After she said it, I sort of remembered something like that, but there was usually a sign above the patient's bed too. Thanks for making me feel better about it. Like someone else said, I will definitely not make that mistake again.