ACR/EULAR classification criteria for giant cell arteritis
Entry criteria
Evidence of medium- or large-vessel vasculitis on imaging
Alternative diagnoses mimicking vasculitis are excluded
Age ≥ 50 years at the time of diagnosis
Clinical criteria
Morning stiffness in shoulders/neck
Sudden visual loss
Jaw or tongue claudication
New temporal headache
Scalp tenderness
Abnormal examination of the temporal artery (absent or diminished pulse, tenderness, or hard "cord-like" appearance)
Laboratory, imaging, and biopsy criteria
Maximum ESR ≥ 50 mm/hour or maximum CRP ≥ 10 mg/L before initiation of treatment
Positive temporal artery biopsy or halo sign on temporal artery ultrasound
Bilateral axillary involvement (luminal damage, such as stenosis, occlusion, or aneurysm)
FDG-PET activity throughout descending thoracic and abdominal aorta (FDG uptake in the arterial wall greater than liver uptake by visual inspection)
Diagnostic criteria are not met
Reference
Cristina Ponte, Peter C Grayson, Joanna C Robson et al. 2022 American College of Rheumatology / EULAR Classification Criteria for Giant Cell Arteritis. Arthritis Rheumatol. 2022 Dec;74(12):1881-1889.
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