Question: what is the difference between stage 3 and stage 4 kidney disease?
Answer: Stage 3 kidney disease is considered moderate, with a noticeable decrease in kidney function. Once the glomerular filtration rate, or gfr, decreases to less than 30% the patient is considered to be in Stage 4 of chronic kidney disease. At less than 30% function the patient will be in Stage 4 kidney disease.