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Table 2 Definition and staging of CKD

From: Role of kidney injury in sepsis

CKD is defined as either of the following present for >3 months
1) Markers of kidney damage (one or more)
  Albuminuria, urine sediment abnormalities, electrolyte, or other abnormalities attributable to tubular disorders, abnormalities detected by histology, structural abnormalities detected by imaging, history of kidney transplantation
2) Decreased GFR; GFR <60 mL/min/1.73 m2 (GFR categories G3a–G5)
GFR category GFR (mL/min/1.73 m2)   Albuminuria category AER (mg/day)  
G1 >90 Normal or high A1 <30 Normal to mildly increased
G2 60–89 Mildly decreased A2 30–300 Moderately increased
G3a 45–59 Mildly to moderately decreased A3 >300 Severely increased
G3b 30–44 Moderately to severely decreased    
G4 15–29 Severely decreased    
G5 <15 Kidney failure    
  1. GFR glomerular filtration rate, AER albumin excretion rate