WIfI = Wound, Ischemia, foot Infection. This tool generates the WIfI component code,
a total burden score, and an estimated limb-threat risk level. Component grades are 0–3 for each domain.
1. Wound Grade
Wound grade reflects tissue loss severity and expected extent of debridement or minor amputation needed for limb salvage.
2. Ischemia Grade
WIfI ischemia grading is based on noninvasive perfusion testing such as ABI, ankle pressure, toe pressure, or TcPO2. Toe pressure/TcPO2 is often preferred when ABI is unreliable.
3. Foot Infection Grade
Infection severity is aligned with commonly used diabetic foot infection severity frameworks incorporated into WIfI.
WIfI Code
W0 I0 fI0
Total burden score:0 / 9
Estimated clinical stage:Stage 1
Risk level: Very low limb threat
Standard WIfI risk labels: Stage 1 = very low, Stage 2 = low, Stage 3 = moderate, Stage 4 = high 1-year amputation risk.
This version estimates stage from the entered component burden for demonstration use. For production clinical use,
replace the stage estimator with the exact official SVS WIfI combination lookup table used by your service.
WIfI Classification stands for Wound, Ischemia, and foot Infection classification.
It is a clinical staging system used to estimate how threatened a lower limb is, especially in people with chronic limb-threatening ischemia (CLTI) and complex foot wounds. It grades 3 separate domains:
Wound: how much tissue loss or ulceration is present
Ischemia: how poor the blood flow is
foot Infection: how severe the infection is
Each domain is graded from 0 to 3, and the combination is used to assign a clinical stage from 1 to 4. Higher stages mean greater limb threat and higher risk of major amputation at 1 year. Stage 1 is very low risk, stage 2 low risk, stage 3 moderate risk, and stage 4 high risk.
Doctors use WIfI to help with:
estimating amputation risk
deciding how urgent treatment or revascularization may be
comparing severity across patients
tracking prognosis over time
So in simple terms, WIfI is a way to classify how serious a threatened foot or leg is by looking at the wound, blood flow, and infection together.
