Pre-hospital attendance has been consolidated in Brazil based on norms established in ministerial ordinances which culminated in the implantation of Mobile Emergency Care Services in the country. This study evaluated the results produced in Teresina in the state of Piauí, analyzing the nature of the occurrences, the response time, and the referral of the attendances in the period 2005 – 2011. It is evaluative, descriptive and quantitative research, based on data obtained from patient notes and consolidation of the same. A higher number of requests for clinical emergencies was ascertained in adults, a high but shrinking demand for clinical and obstetric emergencies, and an increasing demand due to traffic accidents. It was determined that the time spent travelling to the care center was greater than recommended for urban or rural zones. It is concluded that in the municipality under study, this Service needs to reduce the response times, with optimization of the provision of hospital care.