Patient misidentification errors are surprisingly common, as demonstrated in studies in the inpatient and emergency department settings. In this study, a children's hospital conducted a continuous quality improvement intervention to reduce misidentification errors. Interventions—many of which were suggested by staff—included wristband standardization and a "stop-the-line" policy if a misidentification error was suspected. The project resulted in a significant and sustained reduction in these errors. An AHRQ WebM&M commentary discusses a near miss that occurred due to a misidentification error in the labeling of phlebotomy specimens.