In the last years an important change has taken place regarding doctor-patient relationships. One of its effects is that today healthcare results are measured in terms of effectiveness, efficiency, patient's perception of pain or autonomy, physical and mental well-being and, also, in terms of satisfaction with the achieved outcome. In literature it is easy to find studies on patient satisfaction with the conditions of hospitalization, emergencies, or visits. However, it is not usual, to find studies on patient satisfaction with medical outcomes, and this is the kind of information most relevant to clinical use. The concept of "patient-focused-care" obeys to this new position that is based on the recognition of patients' active role in the decision-making process and the notion that clinical decisions should take patients' views and perceptions into account. In this paper, the concept of patients' satisfaction is reviewed as a health outcome. The theories, instruments, methodological questions and implications of this measure are analysed in order to assess and improve the health care presently provided.