An observational, descriptive and cross-sectional study was performed to determine the factors associated with the degree of user satisfaction at the outpatient Gastroenterology Service in the Air Force´s Central Hospital from Peru, because the patient’s insatisfaction is associated to the level of professional excellence, the efficient use of resources and very low risk for the patient. e sample consisted of 221 patients. It was found that 21.3% patients were satised with the care provided, 26.7% in the reliability component, 31.2% in the liability component, 48% in the security component, 38.9% in the empathy component and 32.6% in the tangible component. Insatisfaction was observed in 75 (70.8%) of males, 99 (86.1%) of females (p=0.005), 65 (70.7%) of direct beneciaries and 109 (84.5%) of the family members (p=0.013). Also, as the waiting time for care increased patient´s satisfaction decreased (r=-0.316, p=0.000).