CKD Risk Heatmap (KDIGO)
Enter the patient's eGFR and urine albumin-to-creatinine ratio (ACR) to determine the KDIGO risk category for kidney failure and CKD progression.
Use urine ACR from a spot urine sample. Convert from mg/mmol or mg/g as required.
How to Use This Calculator
Measure eGFR and albuminuria
Use a validated eGFR equation (CKD-EPI 2021) and a urine albumin-creatinine ratio from a morning spot sample.
Enter values and review staging
The tool maps the patient to KDIGO GFR (G1–G5) and albuminuria (A1–A3) categories to determine risk colour.
Plan follow-up frequency
Use the risk level to set monitoring intervals, need for nephrology referral, and initiation of renoprotective therapies.
Formula
GFR stages: G1 ≥90, G2 60–89, G3a 45–59, G3b 30–44, G4 15–29, G5 <15 mL/min/1.73 m².
Albuminuria stages: A1 <30 mg/g, A2 30–300 mg/g, A3 >300 mg/g (convert mg/mmol × 8.84).
The intersecting cell in the KDIGO heatmap defines kidney failure risk and recommended monitoring intensity.
Full Description
KDIGO integrates eGFR (G1–G5) and albuminuria (A1–A3) to stratify chronic kidney disease progression and kidney failure risk. Higher albuminuria markedly increases risk at any eGFR. This tool mirrors the KDIGO risk grid, guiding how often to monitor kidney function, when to refer to nephrology, and how aggressively to manage blood pressure, diabetes, and cardiovascular risk. Consider additional risk calculators (e.g., Kidney Failure Risk Equation) for precise 2- and 5-year failure probabilities when available.
Frequently Asked Questions
How often should I repeat eGFR and ACR?
Risk categories guide frequency: green yearly, yellow every 6–12 months, orange/red every 3–6 months, and dark red every 1–3 months with nephrology oversight.
Does the calculator predict exact probabilities?
No, it reflects KDIGO risk bands. For quantitative 2- or 5-year predictions, use the Kidney Failure Risk Equation (KFRE) when validated inputs are available.
What if albuminuria data are unavailable?
Order a urine ACR. If missing, interpret risk cautiously — albuminuria greatly impacts prognosis and management decisions.
Do comorbidities change risk?
Yes. Diabetes, hypertension, and cardiovascular disease accelerate progression. Use this tool alongside clinical judgement and patient-specific factors.