why did dr carter need a kidney transplant
John Carter (ER) 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[3] 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.