Grade | Category | Clinical description | Objective criteria |
---|---|---|---|
0 | 0 | Asymptomatic - no hemodynamically significant occlusive disease | Normal treadmill test and ABI ≥0.9 |
 | 1 | Mild claudication | Completes treadmill test. AP after exercise >50 mmHg, but at least 20 mmHg lower than resting value |
I | 2 | Moderate claudication | Between categories 1 and 3 |
 | 3 | Severe claudication | Cannot complete treadmill test and AP after exercise <50 mmHg |
II | 4 | Ischemic rest pain | Resting AP <40 mmHg, flat or barely pulsatile ankle or metatarsal PVR, TP <30 mmHg |
III | 5 | Minor tissue loss - nonhealing ulcer, focal gangrene with diffuse pedal ischemia | Resting AP <60 mmHg, ankle or metatarsal PVR flat or barely pulsatile, TP <40 mmHg |
 | 6 | Major tissue loss - extending above TM level, functional foot no longer salvageable | Same as category 5 |