<P> Carter later returns in the Season 15 episode , `` The Beginning of the End '' , in which he rejoins the ER at County General . He explains to Cate Banfield that he is relocating to Chicago , and is looking to pick up some shifts . She agrees , after finding out that one of his teachers at the hospital was Mark Greene . He visits the Joshua Makalo Carter Center . At the end of the episode , it is shown that Carter is on dialysis because of amyloidosis developing from schistosomiasis which irreparably damaged Carter 's remaining kidney . He is back in Chicago to be placed on the US transplant list . Working in the ER once again , he is shown to still be a good doctor with good judgment , but is still catching up with the latest medicines and techniques being used in the US . Eventually , his condition worsens , causing him to collapse while attending to a patient . While being treated by Dr Gates and Dr Morris , he goes into V - tach , but is brought back thanks to Morris 's quick - thinking . He is transferred to Northwestern Medical Center . </P>
<P> Carter later returns in the Season 15 episode , `` The Beginning of the End '' , in which he rejoins the ER at County General . He explains to Cate Banfield that he is relocating to Chicago , and is looking to pick up some shifts . She agrees , after finding out that one of his teachers at the hospital was Mark Greene . He visits the Joshua Makalo Carter Center . At the end of the episode , it is shown that Carter is on dialysis because of amyloidosis developing from schistosomiasis which irreparably damaged Carter 's remaining kidney . He is back in Chicago to be placed on the US transplant list . Working in the ER once again , he is shown to still be a good doctor with good judgment , but is still catching up with the latest medicines and techniques being used in the US . Eventually , his condition worsens , causing him to collapse while attending to a patient . While being treated by Dr Gates and Dr Morris , he goes into V - tach , but is brought back thanks to Morris 's quick - thinking . He is transferred to Northwestern Medical Center . </P>
why did dr carter need a kidney transplant
why did dr carter need a kidney transplant
amyloidosis from schistosomiasis
amyloidosis from schistosomiasis