Peripheral arterial disease (pAVD) can be classified according to Fontaine as follows:
| Stage | Symptoms |
| I | Asymptomatic |
| IIa | Complaint-free walking distance > 200 m |
| IIb | Complaint-free walking distance < 200 m |
| IIc | Lesions (injuries) without the presence of critical ischemia (reduced blood flow) |
| III | Ischemic pain at rest |
| IV | Trophic (nutritional) lesions such as necrosis (dead tissue), ulceration (ulceration), gangrene (special form of coagulation necrosis; it occurs after prolonged relative or absolute ischemia (reduced blood flow) and is caused by necrosis) |
Notice: Stage I may also include patients identified by a decreased ABI (ankle-brachial index) who have severe vascular disease. These are patients in whom the ability to walk is severely limited due to frailty, heart failure, neuropathy, etc. This subgroup is referred to as masked LEAD according to the new terminology.Modified Fontaine Classification for Clinical Stages of Lower Extremity Occlusive Disease (LEAD).
| Stage | Symptoms |
| I | Asymptomatic |
| IIa | Non-disabling intermittent claudication (intermittent claudication) |
| IIb | disabling intermittent claudication |
| III | Ischemic pain at rest |
| IV | Trophic (nutritional) lesions such as necrosis (dead tissue), ulceration (ulceration), gangrene (special form of coagulation necrosis; it occurs after prolonged relative or absolute ischemia (reduced blood flow) and is caused by necrosis) |
Peripheral arterial disease (pAVD) can be classified according to Rutherford as follows:
| Stage | Symptoms |
| 0 | Asymptomatic |
| 1 | Minor intermittent claudication |
| 2 | Moderate intermittent claudication |
| 3 | Severe intermittent claudication |
| 4 | Ischemic pain at rest |
| 5 | Distal (positional designation facing outward from body trunk) trophic (nutritional) lesions/small necrosis |
| 6 | Proximal (positional designation meaning located toward the body or extending toward the body) trophic disorders extending above the metatarsal level (metatarsal bone) trophic lesions/large necrosis |