Introduction: Currently, the use of health technologies in the health system has become a subject of constant study and innovation. In this context, in an institution accredited by the Joint Commission International (JCI), a web application was implemented to manage critical results, which were defined as results that could put the patient's life at risk. Objectives: this study seeks to evaluate the effectiveness of an application in reporting critical results. Material and methods: A retrospective cohort study was carried out. Two stages were compared: the baseline stage (software implementation) versus the final stage (evaluation). Results: 122 critical results were registered in the implementation stage and 113 in the evaluation stage. A decrease was found in the average response time of the professional in the evaluation stage in relation to the implementation stage. The transcription in the records increased from 75.4% to 93.8% p <0.00, the continuity of care by the same doctor increased from 41.0% to 54.9% p <0.03. Likewise, the probability of death was reduced by 68%. Conclusions: In the evaluation stage, mortality decreased and the transcription in the information registry of the critical results application improved towards the patient's clinical history. Likewise, it was possible to optimize the quality of care by ensuring that the follow-up of the patient throughout the entire care is carried out by the same doctor.