Unlike acute kidney injury, chronic kidney disease
progresses slowly and is staged based on glomerular
filtration rate (GFR), with a normal or high
GFR (at or above 90 mL/min/1.73 m2) signifying
kidney damage, or stage 1, and a low GFR (below
15 mL/min/1.73 m2) signifying kidney failure, or
stage 5.12