ABSTRACT Background. The level of patient satisfaction with medical care is a very important indicator of quality of care. The entrance door to the hospital is the emergency services, so the quality of care in the emergency services should be as high as possible, however, there are not many studies in Mexico, although it is believed that most public hospitals nationwide do not have high satisfaction rates. By knowing the levels of satisfaction, strategies can be devised to improve and make the quality of care in hospital services more efficient, mainly in emergency departments, which are the gateway between the patient and hospitalization and specialized management. Objective. The aim of this study was to determine the level of satisfaction with care of patients treated in the emergency department. Material and methods. This is an observational, prospective, cross- sectional, survey-type study that was carried out in patients discharged from the emergency department of HGZ no. 33 of the IMSS in Monterrey, Nuevo León, with any diagnosis, who met the inclusion criteria; Before their discharge, the measurement instrument was applied, which has two sections, the first of personal data, such as sex, age, schooling and another section that was the SERVQUAL survey to measure satisfaction in care. A database was created, which was analyzed to establish association and relationship with the other variables with the level of satisfaction. Results. A total of 309 were included, 44.7% (n=138) were female and 55.3% (n=171) were male, with a minimum age of 18 and a maximum of 98 years, a mean age of 57.3 years (± 8.3 years). The SERVQUAL score was less than 0 points and greater than 67 points, with a mean of 32.45 points (± 11.4 points). 62.8% (n=194) had very satisfactory care, 22% (n=68) had satisfactory care, and 15.2% (n=47) had not at all satisfactory XVII care. The most important variable for satisfaction was empathy in 29.4% (n=91) and the least important was reliability in 12% (n= 37). The minimum attention time was 15 minutes while the maximum was 720 minutes with a mean of 151 minutes (± 80.5 minutes). Secondary education was the most prevalent in 35.9% (n=111), 43% (n=133) were unemployed; An inversely proportional correlation was observed between satisfaction score and attention time (p=0.001). Conclusions. A high level of satisfaction was obtained, with 62.8% reporting a very satisfactory level of care. Waiting time is a very important variable in relation to satisfaction with medical care in the emergency department; It was observed that there is an inversely proportional correlation between time and satisfaction of care (in score), which means that the level of the score will depend on the waiting time, with a higher score (higher satisfaction) if the waiting time is shorter and vice versa (p=0.001). With the results of this study, we can conclude that in this unit there is a good level of satisfaction on the part of users and that the time of attention is the only obstacle that prevents us from reaching a level of excellence in care.