KDIGO AKI stages
Nephrology and urology
Also known as: KDIGO-Stadien der akuten Nierenschädigung (AKI) · KDIGO akut böbrek hasarı evreleri · KDIGO definition and stages of acute kidney injury (AKI)
What it is for
Acute kidney injury (AKI) per KDIGO 2012 is any of: a rise in serum creatinine (SCr) by ≥0.3 mg/dl (≥26.5 µmol/l) within 48 hours; a rise in SCr to ≥1.5 times baseline known or presumed to have occurred within the prior 7 days; or urine volume <0.5 ml/kg/h for 6 hours. Severity is staged 1–3; the stage follows whichever criterion (creatinine or urine output) gives the higher stage.
Classification
| Category | Description |
|---|---|
| Stage 1 | SCr 1.5–1.9 times baseline, or an increase of ≥0.3 mg/dl (≥26.5 µmol/l); or urine output <0.5 ml/kg/h for 6–12 hours. |
| Stage 2 | SCr 2.0–2.9 times baseline; or urine output <0.5 ml/kg/h for ≥12 hours. |
| Stage 3 | SCr 3.0 times baseline or more, or SCr rise to ≥4.0 mg/dl (≥353.6 µmol/l), or start of renal replacement therapy, or in patients under 18 years a fall in eGFR to <35 ml/min per 1.73 m²; or urine output <0.3 ml/kg/h for ≥24 hours, or anuria for ≥12 hours. |
| Related systems | KDIGO combines the earlier RIFLE (2004) and AKIN (2007) criteria. |
Source
KDIGO Clinical Practice Guideline for Acute Kidney Injury
KDIGO · Kidney Int Suppl 2012;2(1):1–138
- Edition
- KDIGO 2012 AKI guideline (current published edition; a 2026 KDIGO AKI/AKD guideline was released as a public-review draft and is not yet final)
- Checked on
Summary of the published classification in our own words. Not a substitute for the original publication.
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