ABSTRACT Objective: This study aimed to assess urinary selenium concentration (USC) and its correlation with non-thyroidal illness syndrome (NTIS) and inflammatory markers in hospitalized adult patients with COVID-19. Subjects and methods: A prospective study was conducted to investigate urinary selenium (Se) concentration in adult patients hospitalized with COVID-19 between June and August 2020. Urine and serum samples were collected before complications occurred, always within the first 48 hours after onset. A total of 121 patients were stratified into three tertiles […]