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Several diagnostic aids have been developed to improve diagnosis in suspected appendicitis including ultrasonography and clinical diagnostic scoring. The aim of this study was to elaborate a new scoring system and to measure its accuracy in the preoperative diagnosis of appendicitis, comparing it with the available scoring systems.

The clinical, radiological and ultrasonographic data of 192 patients with suspected appendicitis were collected prospectively.

Only six of the 12 variables analysed were shown to have prognostic significance. Using Bayesian methodology, a weight was given to each criterion and two overall scores were calculated (ultrasonographic and classical scores). A cut‐off point was identified to separate patients who needed surgery and those for observation. The ultrasonographic score showed an 81 per cent sensitivity and a 96 per cent specificity …