🧫 Acute Kidney Injury AKI Staging (KDIGO)
This tool stages acute kidney injury by the KDIGO criteria using baseline/current creatinine, urine output, and RRT status, and gives management principles.
The final stage takes the higher of the creatinine and urine-output criteria, and starting RRT automatically defines Stage 3. (original synthesis · not guideline verbatim)
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When to use
Use to assign an AKI stage (taking the higher of the creatinine and urine-output criteria) and to anchor the management approach.
How it works
Stage 1: SCr 1.5–1.9× or rise ≥ 26.5 μmol/L, UO < 0.5 × 6–12 h. Stage 2: SCr 2.0–2.9×, UO < 0.5 × ≥ 12 h. Stage 3: SCr ≥ 3.0× or ≥ 353.6 μmol/L or RRT, UO < 0.3 × ≥ 24 h or anuria ≥ 12 h. Stage = max(creatinine, urine output).
Key points
- The final stage takes the higher of the creatinine and urine-output criteria, and starting RRT automatically defines Stage 3. (original synthesis · not guideline verbatim)
- The urine-output criterion is applied cautiously with diuretics or cirrhotic ascites.
- Management centers on stopping nephrotoxins, optimizing hemodynamics, and identifying prerenal/renal/postrenal causes.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Baseline creatinine | 70 μmol/L |
|---|---|
| Current creatinine | 140 μmol/L |
| Urine output | Normal/not assessed |
| Renal replacement therapy (RRT) started | Yes |
→StageAKI Stage 3
- Creatinine assessment：SCr 2.0× baseline; RRT started → Stage 3
- Urine output assessment：not assessed/normal
- Take the higher：Final stage is the higher of creatinine and urine output = Stage 3
Frequently asked questions
- What is Acute Kidney Injury AKI Staging (KDIGO)?
- This tool stages acute kidney injury by the KDIGO criteria using baseline/current creatinine, urine output, and RRT status, and gives management principles.
- How is Acute Kidney Injury AKI Staging (KDIGO) calculated? What is the core formula?
- Stage 1: SCr 1.5–1.9× or rise ≥ 26.5 μmol/L, UO < 0.5 × 6–12 h. Stage 2: SCr 2.0–2.9×, UO < 0.5 × ≥ 12 h. Stage 3: SCr ≥ 3.0× or ≥ 353.6 μmol/L or RRT, UO < 0.3 × ≥ 24 h or anuria ≥ 12 h. Stage = max(creatinine, urine output).
- When is Acute Kidney Injury AKI Staging (KDIGO) used?
- Use to assign an AKI stage (taking the higher of the creatinine and urine-output criteria) and to anchor the management approach.
- What are the key clinical points for Acute Kidney Injury AKI Staging (KDIGO)?
- The final stage takes the higher of the creatinine and urine-output criteria, and starting RRT automatically defines Stage 3. (original synthesis · not guideline verbatim) The urine-output criterion is applied cautiously with diuretics or cirrhotic ascites. Management centers on stopping nephrotoxins, optimizing hemodynamics, and identifying prerenal/renal/postrenal causes.
- What are the limits and cautions when using Acute Kidney Injury AKI Staging (KDIGO)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Acute Kidney Injury AKI Staging (KDIGO) calculated in practice? Can you show a worked example?
- Inputs: Baseline creatinine 70 μmol/L, Current creatinine 140 μmol/L, Urine output Normal/not assessed, Renal replacement therapy (RRT) started Yes → Result: Stage AKI Stage 3（Creatinine assessment: SCr 2.0× baseline; RRT started → Stage 3, Urine output assessment: not assessed/normal, Take the higher: Final stage is the higher of creatinine and urine output = Stage 3）