Objective: To evaluate the diagnostic accuracy of the Alvarado score in reducing the rate of negative appendicectomy at Queen’s Hospital, a small district general hospital in England. Methodology: The retrospective, analytical study included all children who were ≤16 years old with a preliminary diagnosis of acute appendicitis undergoing appendicectomy subsequently. Children with other causes of acute abdominal pain were excluded from the study. A total of 118 patients were included. Based on their calculated Alvarado scores, they were stratified into two groups: Group A (Alvarado score <6) and Group B (Alvarado score ≥6). Alvarado scores were compared with the histopathology reports, the gold standard for diagnosing acute appendicitis. The data gathered was then subjected to statistical analysis to measure our objective. Results: Out of the 118 patients (85 males, 33 females), 46 belonged to Group A and 72 to Group B. Final diagnosis of acute appendicitis from histopathology reports was confirmed in 94 cases (79.6%). The overall sensitivity and positive predictive value of Alvarado score for acute appendicitis were 92% and 94% respectively. The area under the ROC curve was 0.9 indicating a highly accurate test. The sensitivity was only slightly higher for males with a score of <6 than females (94.9% vs. 89.5%, p < 0.05). However, for scores ≥6, sensitivity among males was significantly higher than females (79% vs. 62.6%; p < 0.05). A multivariate analysis revealed that anorexia, right iliac fossa tenderness and rebound tenderness are significantly correlated with a correct diagnosis of acute appendicitis (p = 0.025, 0.037 and 0.026 respectively). Conclusion: The presence of a high Alvarado score (≥6) is highly predictive of acute appendicitis. In women of childbearing age and Alvarado scores of <6, other pathologies that mimic appendicitis must be considered. An US scan of abdomen and pelvis should be considered in a woman of child-bearing age before proceeding to a surgical intervention.