Introduction. Currently, one of the challenges for healthcare systems is providing quality services. Perceived quality refers to a person's overall judgment of quality based on their experience with a product or service. In the private healthcare sector, quality assessment is highly useful, as it allows for the identification of areas for improvement and the design of strategies to enhance the organization. Objective. The objective of this study was to identify the level of perceived quality in a secondary care unit in the city of San Luis Potosí. Methodology. This is a descriptive, cross-sectional, quantitative study conducted in a secondary-care medical unit in San Luis Potosí, Mexico. The Health Services Users' Perception of Quality (PECASUSS) instrument, with a Cronbach's alpha of 0.978, was used to evaluate 15 dimensions of perceived quality. For this study, these dimensions were grouped into three time points: at the beginning of care, during care, and after receiving care. Data were collected from 120 patients who received care between October and December 2024, after obtaining authorization from an ethics committee. SPSS version 21 was used for data capture and processing. Results: 95% of patients reported high perceived quality of care at all three time points. Conclusions: Patients perceived the quality of care as very good, indicating that the organization should strengthen this aspect.