This National Institute for Health and Care Excellence (NICE) guideline offers recommendations on renal replacement therapy (including transplant) and conservative management.
Renal replacement therapy (RRT) is a term used to encompass life-supporting treatments for severe acute kidney injury (AKI) or stage five chronic kidney disease (CKD). It includes all types of dialysis and renal transplantation. These are collectively referred to in the guideline as modalities of RRT.
Conservative management is full supportive management (including the control of symptoms and complications and advance care planning) for those in the later stages of CKD who, in conjunction with carers and the clinical team, decide against RRT.
You can read the guideline on NICE's website.