Objective-To examine whether pre-abuse rates and patterns of emergency department (ED) visits between children with supported child abuse and age-matched controls are useful markers for abuse risk.Study design-A population-based case-control study using probabilistic linkage of four statewide data sets. Cases were abused children <13 years, identified between 1/1/01-12/31/02. For each case, a birth date matched population-based control was obtained. Outcome measures were rate ratios of ED visits in cases compared with controls.Results-9795 cases and 9795 controls met inclusion criteria. 4574 cases (47%) had an ED visit; thus linked to the ED database versus 2647 controls (27%). The crude ED visit rate per 10 000 persondays of exposure was 8.2 visits for cases compared with 3.9 visits for controls. Cases were almost twice as likely as controls (adjusted rate ratio = 1.8, 95% CI:1.5, 1.8) to have had a prior ED visit. Leading ED discharge diagnoses were similar for both groups.Conclusions-Children with supported child abuse have higher ED use prior to abuse diagnosis, when compared with the general pediatric population. However, neither the rate of ED use nor the pattern of diagnoses offers sufficient specificity to be useful markers of risk for abuse.Child abuse is the fourth leading cause of childhood death in the United States.(1) Current evidence suggests that many children who die from child abuse are seen by a health care provider for medical conditions related to abuse prior to the diagnosis, possibly resulting in a missed opportunity for intervention. (2-12) For example, King studied a cohort of fatally abused children and found that almost 20% of the children had documented contact with the health care community for reasons other than routine care within a month before death. (7) Similarly, Jenny et al found that 31% of children with abusive head trauma had been seen by a health care provider prior to recognition of their head injury, with a mean time to correct diagnosis in these children of seven days. (2) Author contact: Elisabeth Guenther, MD, MPH, Associate Professor, Division of Pediatric Emergency Medicine, University of Utah School of Medicine, PO Box 581289, Salt Lake City, Utah 84158, Phone: (801)587-6570, Fax: (801)587-6595, E-mail: elisabeth.guenther@hsc.utah.edu. Edited by TW and WFB Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. These studies suggest that the ED may be a clinical setting where there is an opportunity for earlier identification of both physical and sexual child abuse; 12 however, there is little information on whether abused c...