The purpose of Internal auditing is to verify compliance of the laboratory’s quality management system to ISO 15189:2022 and additional requirements, as well as to ensure the system is effectively implemented and maintained. The MiChem team will clarify the various aspects (compliance and implementation) that laboratories should audit to ensure compliance to ISO15189:2022 Clause 8.5, 8.6, 8.7, 8.8 and 8.9.