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3. Stages 3a and 3b

Stage 3 kidney disease is further divided into two stages: 3a and 3b. A study demonstrated the necessity for this distinction by showing that the two sub-stages vary in their risk of serious outcomes. The study followed patients with chronic kidney disease for over 10 years and concluded that stage 3B patients have an increased risk of renal and cardiovascular complications.

renal function test jarun011 / Getty Images

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