The objective of this chapter is to expand the discussions regarding the application of the Fast Track method and the standardized work in emergency services with the Lean healthcare approach. In this chapter, the authors present some fundamental concepts to broaden the understanding of the theoretical/methodological implications necessary for the application of the Fast Track method and standardized work in the healthcare area, with the Lean healthcare approach. They present the case study resulting from the execution of the Lean project in the 24-hour UPA, which was carried out in 50 selected emergency care units, as a result of the agreement with the Ministry of Health through the Department of Hospitals and Urgencies (DAHU/MS) and with the Rector of the Fluminense Federal University.