The Eurotransplant Reference Laboratory (ETRL) is an integral part of Eurotransplant and has an important role in the quality system of the Eurotransplant organization. It serves as the link between Eurotransplant and the tissue typing laboratories affiliated to transplantation centers collaborating within the framework of Eurotransplant. The ETRL is situated in the Leiden University Medical Center, the Netherlands. The ETRL has a dedicated website with information on its roles and responsibilities.