ABSTRACT Objective: to analyze the patient care flow in a Hemodynamics service grounded on Lean Thinking based on Value Stream Mapping. Method: an exploratory-descriptive case study carried out in the Hemodynamics service of a public university hospital from southern Brazil. Data collection was conducted through participant observation with twelve members of the multiprofessional team and interviews with five participants from May 2021 to February 2022. The analysis was based on the Lean framework and on the stages foreseen in Value Stream Mapping. Results: the Value Stream Map of the current situation of the service was prepared, identifying suppliers and customers of the process and their requirements. A total of 61 problems related to unmet requirements were listed, of which 12 were prioritized in order to promote improvement planning. Conclusion: with Value Stream Mapping it was possible to establish improvement priorities that exert impacts on operational performance of the service. It was identified that improvements related to standardization of the activities minimize waste from failures and waiting times, which were the most prevalent in the service, among others observed.