8.4.1 Specific criteria for withdrawal (if applicable) For whatever reason the patient is free to withdraw from the study. After the patient is asked to participate in the study in the emergency department or on the surgical ward and has signed the informed consent form, he/she will usually have to wait for some time before he/she is operated on. In theatre the LAPP score will be used. Postoperatively the patient can still decide to withdraw from the study, although the decision to remove or not to remove the appendix has already been made. The patient will be prospective followed for 12 months and during this period the patient can still decide to withdraw from the study, then all saved data and forms will be deleted from the database.