Table 1-1-2 Ischemia.

Grade	ABI	AP (mmHg)	TP,TcPO2 (mmHg)
0	≧0.80	>100	≧60
1	0.60–0.79	70–100	40–59
2	0.40–0.59	50–70	30–39
3	≦0.39	<50	<30

ABI: ankle brachial (pressure) index, AP: ankle pressure, PVR: pulse volume recording, SPP: skin perfusion pressure, TP: toe pressure, TcPO₂: transcutaneous oximetry. Patients with diabetes should have TP measurements. If arterial calcification precludes reliable ABI or TP measurements, ischemia should be documented by TcPO₂, SPP, PVR. If TP and ABI measurements result in different grades, TP will be the primary determinant of ischemia grade. Flat or minimally pulsatile forefoot PVR=grade 3.