An admi­nis­tra­ti­ve unit, usual­ly loca­ted at a uni­ver­si­ty or insti­tu­te for trans­fu­si­on medi­ci­ne, that is respon­si­ble for hand­ling the donor search while liai­sing with the atten­ding phy­si­ci­ans, an HLA labo­ra­to­ry and the ZKRD.