In many coun­tries, the search for a stem cell donor is orga­ni­zed in a simi­lar way as in Ger­ma­ny. Several donor cen­ters across the coun­try report the data of their donors which is rele­vant to a search to a cen­tral regis­try. Due to the inter­na­tio­nal net­wor­king of all cen­tral regis­tries, the­se donors are avail­ab­le to all pati­ents world­wi­de. The cen­tral regis­try ther­eby coor­di­na­tes and reviews all the pro­ces­ses rela­ting to the donor search.