Urinary tract infection in outpatients: prevalence and antimicrobial susceptibility profile in a study conducted from 2009 to 2012ABSTRACT Urinary Tract Infections (UTI) are a common and frequent complaint in clinical medicine, which occur at any age mainly in women. This study aimed to identify the prevalent microorganisms in UTI in patients served in a communitarian Lab in the city of Chapecó-SC, along with the susceptibility profile against antimicrobials as well as the age and gender group with the highest occurrence of infections. A retrospective epidemiologic study was carried on through the analysis of appraisal reports over three years (September 2009 to September 2012. Over the period this study was conducted, 550 samples were positive, from those, 82.4% belonged to women, and the age group with most prevalence was that from 26 to 38 years old. The most frequent etiologic agent was Escherichia coli; among the tested antimicrobial the class of fluoroquinolones presented the highest resistance with 40.1% and the class of nitrofurantoin presented the lowest resistance rate with 1.6%. These results match with others from different regions, nevertheless, further studies are necessary with larger sample size as well as in different moments.