I am really not knowledgeable about the CEA levels, but I do want to tell you that I hope you get what you need whether that is a PET scan or not. I know you have been through a lot, because my husband has gone through all the same things you mentioned and more (chemo-radiation for six weeks after the 8 FLOTs). I commend you on your courage, as I know it must have taken a lot to go through FLOT and gastrectomy. I am going to say a prayer for you right now. Wishing you healing and wellness.