Acute kidney injury: increase in creatinine by 0.3 mg/dl in 48h; or increase in creatinine x 1.5 of baseline within 7d; or urine volume < .5 cc/kg/h for 6h
Chronic kidney disease: abnormal kidney function or structure x 3m; GFR > 90 (nl or high); Stage 2, GFR 60-90ml/min (mild decrease); 3a 45-59 (mild-mod); 3b 30-44 (mod-severe); 4 15-29 (severe); 5 < 15 (failure)