as well as national metrology and reference institutes [],and the IVD-industry. In addition, (inter)national professional organizations, such as the International Federation of Clinical Chemistry (IFCC) and the American Association of Clinical Chemistry (AACC), have adopted metrological traceability,e.g., with the establishment of the IFCC Commission on Traceability in Laboratory Medicine (IFCC C-TLM)and the AACC Harmonization Initiative