The new Adult Appendicitis Score classified half of the actual appendicitis patients in high probability group, with specificity comparable to CT, and better than actual diagnostics at the emergency department. Nearly one third of patients with appendicitis were classified as in the extra high probability group. Specificity in this group was superior to specificity of CT in our study population, and superior or comparable to specificity of CT overall [24]. Only few patients with appendicitis, among them no complicated cases, were classified into the low probability group.