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Introduction: The presence of band cells > 10% of the total white blood cell (WBC) count (“bandemia”) is often used as an indicator of serious bacterial illness (SBI). Results from studies of bandemia as a predictor of SBI were conflicting and little is known about the relationship between severe bandemia (SB) and clinical outcomes from SBI in children. We hypothesized that SB (band level > 20%) is not associated with adverse outcomes in an emergency department (ED) pediatric population. Methods: Medical records from children between the ages of two months and 18 years with SB who presented to a tertiary referral regional hospital were studied. Outcomes were categorized as severe adverse events (SAEs) or moderate adverse events (MAEs). Multivariate logistic regressions were used to assess the association between SB and outcomes. Results: We analyzed 102 patients. Mean age (standard deviation, SD) was 5.25 (0.5) years, 18 (18%) had MAE, 21 (21%) had SAE, and no patients died. Mean band levels were similar between groups: no adverse events 28 (10) vs. SAE 31 (9) vs. MAE 27 (8), p=0.64. Multivariate logistic regressions showed SB was not associated with any adverse events (odds ratio (OR) 1.04, 95% confidence interval (CI) 0.9-1.1, p=0.27). Non-normal X-ray (XR) (OR 17, 95% CI 3.3-90, p