🫘 KDIGO Acute Kidney Injury Staging
KDIGO staging classifies acute kidney injury severity from serum creatinine change, urine output, and dialysis status.
KDIGO Acute Kidney Injury Staging
Current serum creatinine (μmol/L)
Baseline serum creatinine (μmol/L)
Urine-output criterion (take the most severe)
Renal replacement therapy (dialysis) started
When to use
Enter current and baseline creatinine and the worst urine-output criterion; the tool returns the AKI stage (1–3) taking the most severe component.
How it works
Stage = max of creatinine stage and urine-output stage; dialysis = stage 3. Cr stage 3 if ≥353.6 μmol/L or ≥3× baseline; stage 2 if ≥2×; stage 1 if ≥1.5× or rise ≥26.5 μmol/L.
Key points
- AKI is diagnosed by a creatinine rise ≥26.5 μmol/L within 48h or ≥1.5× baseline within 7 days (original synthesis · not guideline verbatim).
- Establishing an accurate baseline and excluding volume/sampling confounders is essential before staging.
- Urine-output criteria can stage AKI even when creatinine has not yet risen, so both must be tracked.
References
- KDIGO Clinical Practice Guideline for Acute Kidney Injury. Kidney Int Suppl. 2012.
- Khwaja A. KDIGO clinical practice guidelines for acute kidney injury. Nephron Clin Pract. 2012.
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.