Objective: To determine the predictive capacity of disease duration (TE) and inflammatory biomarkers to identify complicated acute appendicitis (AAC) in patients under 18 years of age treated at the Regional Hospital of Loreto (HRL), 2023–2024. Methods: Observational, analytical, retrospective, and diagnostic accuracy study. A total of 114 patients with intraoperatively confirmed appendicitis were included. Cut-off points were obtained through ROC curves, and diagnostic performance was evaluated, along with a logistic regression model to assess combined predictive capacity. Results: AAC accounted for 63.2% of cases, and 60.5% were male. The most frequent intraoperative type was gangrenous appendicitis (29.8%); 41.2% of patients were aged 10–14 years, and 10.5% presented with fever. The mean age was 11.4 ± 3.6 years, and the mean hospital stay was 4.3 ± 3.8 days. Cut-off points and ...

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