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Background: Pediatric patients from minoritized racial and ethnic groups receive red blood cell (RBC) transfusions more frequently while undergoing major surgical procedures. Our objective was to identify the contribution of preoperative anemia to racial and ethnic differences in RBC transfusion rates in adolescent spine surgery., Study Design and Methods: This is a multicenter, retrospective cohort study of the National Surgical Quality Improvement Program Pediatric database, 2016 to 2021 for patients in the United States and Canada., Results: Adolescents identifying as non-Hispanic Black, Hispanic, and other race/ethnicity presented with higher rates of preoperative anemia than non-Hispanic White adolescents (16.3%, 10.6%, and 9.9%, vs. 7.8%, respectively; p < .0001) and were transfused at higher rates (14.4%, 11.9%, 16.5%, vs. 10.0%, respectively; p < .0001). Minoritized groups demonstrated higher adjusted odds of RBC transfusion compared with non-Hispanic Whites (non-Hispanic Black: aOR 1.45 95% CI 1.26-1.65, Hispanic: aOR 1.17 95% CI 0.96-1.41, other race/ethnicity: aOR 1.63 95% CI 1.26-2.09). Of the total effect of minoritized race and/or ethnicity on RBC transfusion, 13.9% was attributed to the indirect effect through preoperative anemia., Discussion: In this cohort study, patients from minoritized racial and ethnic groups received RBC transfusions at a higher rate than non-Hispanic White patients, and the difference was partially mediated by preoperative anemia. Future efforts to minimize transfusions and improve health equity should target this modifiable risk factor alongside other sources of disparity and discrimination., (© 2024 AABB.)