Introduction: Identification and promotion of diagnostic methods has been a continuous effort to reduce disease and its complications and reduce costs associated with treatment. Despite all these efforts and improving our knowledge of diseases and diagnostic tools, pediatric appendicitis remains part of the diagnostic challenge in the surgical field. The aim of this is to compare the two diagnostic criteria of appendicitis (Children's Appendicitis Score [PAS] Versus Pediatric Appendicitis Score [CAS]) and evaluation of the diagnostic features of them.
Methods: A retrospective cohort study was conducted on all children admitted to the hospital's emergency center with a possible diagnosis of appendicitis (270 patients) during 2018 and 2019 at Tabriz Pediatric Hospital. Based on the clinical examinations and para-clinical findings some of the patients were underwent the surgical intervention (220 cases) and some discharged and followed up for a period of 2 and 4 weeks later (50 cases). The data were analyzed through SPSS ver. 16 software.
Results: The results of the present study indicated that if CAS was associated with ultrasound, the specificity of these criteria would improve and could be more acceptable compared with the PAS. In addition, it was revealed that WBC≥11000, as well as PMN≥65% and guarding were very specific for diagnosis and complication of acute appendicitis. There was a significant relationship between US findings and pathology reports (P<0.05).
Conclusion: In conclusion, the CAS criteria were more sensitive and the PAS was more specific in diagnosing pediatric acute appendicitis.

Keywords: Pediatric appendicitis, History taking, Physical examination, Diagnostic criteria

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