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. Author manuscript; available in PMC: 2021 Aug 16.
Published in final edited form as: J Vasc Surg. 2019 May 28;69(6 Suppl):3S–125S.e40. doi: 10.1016/j.jvs.2019.02.016

Table 3.3.

Ischemia grading in Wound, Ischemia, and foot Infection (WIfI) classification

Grade ABI Ankle systolic pressure TP, TcPo2
0 ≥0.80 >100 mm Hg ≥60 mm Hg
1 0.6–0.79 70–100 mm Hg 40–59 mm Hg
2 0.4–0.59 50–70 mm Hg 30–39 mm Hg
3 ≤0.39 <50 mm Hg <30 mm Hg

ABI, Ankle-brachial index; TP, toe pressure; TcPo2, transcutaneous oximetry.

Flat or minimally pulsatile forefoot pulse volume recording is grade 3. Measure TP or TcPo2 if ABI incompressible (>1.3). Patients with diabetes should have TP measurements. If arterial calcification precludes reliable ABI or TP measurements, ischemia should be documented by TcPo2, skin perfusion pressure, or pulse volume recording. If TP and ABI measurements result in different grades, TP will be the primary determinant of ischemia grade.