[Usual source of care and Brazilian adolescent access to Primary Health Care (PHC) services].

We analyzed the association between the recognition of a usual source of care (USC) of Primary Health Care (PHC) and access to services among Brazilian adolescents. This is a cross-sectional study using data from the National Adolescent School-based Health Survey with 68,968 Brazilian adolescents and cluster sampling. Descriptive analyses were carried out with Pearson's χ2 and prevalence ratios (PR) using logistic regression models between access and recognition of USC. It was observed that 74.6% reported access, and this was higher among females (79.3%). In the multivariate analysis, there was a positive association (PR: 1.25; 95%CI: 1.24-1.26); and, when stratified by sex, positive associations for both sexes, (PR: 1.30; 95%CI: 1.28-1.31) male and (PR: 1.21; 95%CI: 1.20-1.23) female. The majority of Brazilian adolescents demonstrated PHC as a USC and were able to access services, but lack of access was more frequent among the most economically vulnerable and those with risk behaviors, indicating potentially avoidable inequities with more equitable and longitudinal PHC services.