1990 ACR criteria for the classification of Takayasu arteritis15
| Criterion | Definition |
|---|---|
| A diagnosis of Takayasu arteritis requires that at least 3 of the 6 criteria are met. | |
| Age at disease onset ≤40 years | Development of symptoms or findings related to Takayasu arteritis at age ≤40 years |
| Claudication of extremities | Development and worsening of fatigue and discomfort in muscles of 1 or more extremity while in use, especially the upper extremities |
| Decreased brachial artery pulse | Decreased pulsation of 1 or both brachial arteries |
| Blood pressure difference >10 mm Hg | Difference of >10 mm Hg in systolic blood pressure between arms |
| Bruit over subclavian arteries or aorta | Bruit audible on auscultation over 1 or both subclavian arteries or abdominal aorta |
| Arteriogram abnormality | Arteriographic narrowing or occlusion of the entire aorta, its primary branches, or large arteries in the proximal upper or lower extremities, not caused by arteriosclerosis, fibromuscular dysplasia, or similar causes; changes usually focal or segmental |