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No known kidney disease (Stage 0)
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Kidney damage with normal or high GFR: > (Stage 1)
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Kidney damage with mildly decreased GFR: 60–89 mL/min/1.73 m2 (Stage 2)
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Moderately decreased GFR: 30–59 mL/min/1.73 m2 (Stage 3)
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Severely decreased GFR: 15–29 mL/min/1.73 m2 (Stage 4)
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Kidney failure: GFR <15 mL/min/1.73 m2 or on dialysis (Stage 5)