Purpose: In pediatric intensive care unit (PICU), high mortality risk is a significant issue. Risk adjustment tools are in place for early estimation of mortality risk. Pediatric Risk of Mortality(PRISM), Pediatric Index of Mortality(PIM), Pediatric Logistic Organ Dysfunction(PELOD) and Pediatric Sequential Organ Failure Assessment(PSOFA) are commonly used. The aim of this study was to evaluate the predictive performance of mortality using PRISM III, PIM3, PELOD-2, and PSOFA. Materials and Methods: This retrospective single-center study analysed patients aged between 1month-18years who were treated in PICU for various diseases between April and December2021. Their electronic records were retrospectively examined for demographic characteristics, medical and clinical expectations, and morbidity/mortality. Results: The study included 300 patients with a hospitalization period of 56.73±105.95 days. At the end of the study, 56(18.7%) patients had died.All scoring systems and mortality correlations were statistically significant(p