I had a kidney transplant two years ago, kidney never did work well since day one. My gfr today is 42 I see by your chart that I m stage 3 ckd. My question is with having just one kidney make my stages go faster than someone that has two kidneys and never had a transplant
No. That staging doesn't apply for you and you need to worry. The progression of transplant kidney friends in Chat Doctor.  You can live with one kidney fir decades provided your transplant kidney is taken care properly right from beginning without any complications