The differences between Augmented Reality (AR) systems and computer display based systems create a need for a different approach to the design and development of AR systems. To understand the potential of AR systems in real world tasks the technology must be tested in real world scenarios. This case study includes two qualitative user studies where AR was used for giving instructions to users in a hospital. The data show that the users in the context of medical care are positive towards AR systems as a technology and as a tool for instructions in terms of usefulness and social acceptance. The results indicate that AR technology, should it be introduced as technical support in this context, may become an accepted, and appreciated, part of every day work.