Pediatric Appendicitis Score for Identifying Acute Appendicitis in Children Presenting With Acute Abdominal Pain to the Emergency Department

Objective: To determine the diagnostic accuracy of Pediatric Appendicitis Score (PAS) in predicting appendicitis in children presenting with acute abdominal pain to the Emergency Department (ED) of a private hospital in Pakistan. Methods: This validation study was through retrospective chart review of children between 4–18 years of age with clinical suspicion of acute appendicitis, presenting to the pediatric ED. Diagnostic accuracy was determined using sensitivity, specificity, predictive values, and area under the curve (AUC). Results: 104 children (76% boys) with mean (SD) age of 10.9 (3.5) years met the eligibility criteria. 91% (n=95) patients had moderate to high PAS (score ≥4), and 95% (n=99) had biopsy-proven appendicitis. The likelihood ratio calculated for low, equivocal and high-risk PAS was 0.10, 2.17 and 2.53, respectively. An equivocal PAS (score 4–6) showed a sensitivity of 96.8%, specificity of 80%, positive predictive value of 98.9% and AUC of 0.84 for predicting acute appendicitis. Conclusion: PAS showed good diagnostic accuracy in predicting acute appendicitis in children presenting to the ED.