There is a critical need for evidence-based, broadband behavioral, and ASD screening measures for use in pediatric and early educational settings to ensure that young children at risk for developing social-emotional disorders and/or ASD are provided with early intervention services to optimize long-term outcomes. The BITSEA is a 42-item screener designed to identify social-emotional/behavioral problems and delays/deficits in social-emotional competence among 11-48-month-olds; 19 items describe behaviors consistent with ASD. Secondary data analysis was employed to develop cut-scores for ASD subscales using Receiver Operating Curves, discriminating children with (n = 223) and without (n = 289) ASD. Cut-scores demonstrated moderate-to-high discriminative power, sensitivity, specificity, and PPV. Findings highlight feasibility of using a broadband social-emotional competence and behavior problem screener to improve early detection of ASD.