Stewardship interventions seek to optimize use of healthcare services, such as diagnostic tests or antibiotics. This article reports findings from a 14-site multidisciplinary collaborative evaluating pediatric intensive care unit (PICU) blood culture practices before and after implementation of a diagnostic stewardship intervention. Researchers found that rates of blood cultures, broad-spectrum antibiotic use, and central line-associated blood stream infections (CLABSI) were reduced postintervention.