Classifications of Acute Kidney Injury and Chronic Kidney Disease

Recently developed consensus functional definitions on the basis of specific changes in the serum creatinine concentration and urine volume now complement anatomical approaches to diagnosis.

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Definition and Stages of Chronic Kidney Disease (CKD)

NKF Definition of Chronic Kidney Disease

  • Kidney damage for three or more months, as defined by structural or functional abnormalities of the kidney, with or without decreased GFR, manifested by pathologic abnormalities or markers of kidney damage, including abnormalities in the composition of the blood or urine or abnormalities in imaging tests

  • GFR < 60 mL per minute per 1.73 m2 for three months or more, with or without kidney damage

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