KDIGO AKI Staging
KDIGO acute-kidney-injury staging from the creatinine ratio to baseline (and optional 48-hour rise, urine output, anuria duration, and RRT); returns the creatinine and urine-output sub-stages and the overall stage.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Baseline serum creatinine
- 1.0 mg/dL
- Current serum creatinine
- 3.5 mg/dL
Result: KDIGO AKI Stage 3 (3.5x baseline).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Stage 1
- SCr 1.5-1.9x baseline, or >=0.3 mg/dL rise, or urine under 0.5 mL/kg/hr for 6-12 h.
- Stage 2
- SCr 2.0-2.9x baseline, or urine under 0.5 mL/kg/hr for 12 h or more.
- Stage 3
- SCr 3x baseline or 4.0 mg/dL or more, or RRT, or urine under 0.3 mL/kg/hr for 24 h or anuria 12 h.
What you enter
- Baseline serum creatinine
- Current serum creatinine
- Rise in last 48 h (optional)
- Urine output (optional)
- Urine-output duration (optional)
- Anuria duration (optional)
- RRT initiated
What this is
Stage acute kidney injury per the KDIGO 2012 clinical practice guideline using the serum-creatinine criteria: Stage 1 (>=0.3 mg/dL rise in 48 h or 1.5-1.9x baseline), Stage 2 (2.0-2.9x baseline), or Stage 3 (>=3.0x baseline, creatinine >=4.0 mg/dL, or initiation of RRT). Sophie Well returns the stage along with the ratio and the absolute change so the chart note has the underlying numbers.
When to use it
Use this whenever a creatinine trends up in the inpatient or outpatient setting and you need to assign a KDIGO stage for documentation, billing, or trial enrollment. The creatinine-only path is implemented here; the parallel urine-output criterion (<0.5 mL/kg/h x 6+ h for Stage 1) requires an indwelling measurement and is typically scored separately at the bedside.
How this is calculated
KDIGO Clinical Practice Guideline for Acute Kidney Injury. Kidney Int Suppl 2012;2:1-138. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.
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