Aim: To evaluate PAS score in the diagnosis of pediatric appendicitis at the National hospital of Pediatrics. To describe the factors affecting the accuracy of PAS in the diagnosis of appendicitis. Results: PAS score is effective and can be use for early clinical diagnosis of pediatric appendicitis In this research, AUC of PAS was 0.868 and cut off score was 7, corresponded with a sensitivity of 0.903 and a specificity of 0.653. Physicians' experience played an important role in determining PAS score. The use of antibiotics and pain reliever prior to consultation and the age of patient can affect the accuracy of diagnosis. Patients 4 years old and above and did not use antibiotics and pain reliver prior to consultation gave a more accurate diagnosis by PAS score. Conlcusion: PAS score is simple and easy to perform. It is also effective in early diagnosis of pediatric appendicitis.
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