Table 3.

Adapted from the 2022 American College of Rheumatology/ European Union League Against Rheumatism Classification Criteria for GCA.

Mandatory requirement for all	Age at time of diagnosis ≥ 50 years
Score	Feature
+5	Positive temporal artery biopsy or halo sign on temporal artery ultrasound
+3	Maximum ESR ≥ 50 mm/hour or maximum CRP ≥ 10 mg/Litre prior to the initiation of treatment
+3	Sudden visual loss
+2	New temporal headache
+2	Jaw or tongue claudication
+2	Scalp tenderness
+2	Morning stiffness in the shoulders/neck
+2	Abnormal examination of the temporal artery
+2	Bilateral axillary involvement
+2	FDG-PET activity throughout the aorta

Total score ≥ of 6, with alternate diagnoses excluded, is needed for a classification of GCA.

C-RP C-reactive protein, ESR erythrocyte sedimentation rate, FDG-PET fluorodeoxyglucose (FDG)-positron emission tomography (PET).