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Introduction: Patients presenting to the pediatric emergency department (ED) often undergo unnecessary testing that leads to prolonged ED visits. Lower ED length of stay has been linked to improved patient experience and may reduce ED overcrowding, a costly burden on a health system., Methods: This is a retrospective cohort study involving patient records over the period of 6 months at an urban tertiary children's hospital who presented with seizures. Febrile seizures, seizures associated with trauma, and charts of patients who did not present initially through our ED were excluded., Results: 328 charts were obtained through this search criteria. Head imaging was performed in 52 (16%) patients and consisted of 81% CT (n = 42) and 19% (n = 10) magnetic resonance imaging (MRI). Obtaining an MRI was associated with a 3.5 h longer ED visit (p = 0.07); obtaining a CT was associated with a 1.5 h longer ED visit (p = 0.005). An Electroencephalogram (EEG) was obtained for 67 (20%) visits and was associated with a 3.0 h longer ED length of stay (p < 0.001). Ten % of the CT scans showed new or progressive findings and 40% of the MRIs done provided useful information for management. Thirty-seven % of EEGs performed in new onset seizure patients revealed epileptiform findings and 5% of EEGs in established seizure patients provided meaningful findings important to management., Conclusion: Obtaining neurodiagnostic studies significantly prolongs duration of stay in the ED. Electroencephalograms appear to have the greatest yield in new onset seizure patients and can help make a diagnosis of an epilepsy syndrome in children., (Copyright © 2020 Elsevier Inc. All rights reserved.)