Stage 5 refers to the final stage of chronic kidney disease (CKD), which is characterized by a significant decline in kidney function, typically defined as a glomerular filtration rate (GFR) of less than 15 mL/min. At this stage, the kidneys are no longer able to effectively filter waste products and excess fluids from the blood, leading to the need for renal replacement therapy, such as dialysis or kidney transplantation, to maintain health and life.
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