GiACTA Entry Criteria for the Classification of GCA	ACR Criteria for the Classification of Giant Cell (Temporal) Arteritis^a

Age ≥50 y	Age at disease onset ≥50 y
History of ESR ≥50 mm/h (or CRP ≥2.45 mg/dL if ESR unavailable)	Elevated ESR ≥50 mm/h
At least one of the following: – Unequivocal cranial symptoms of GCA (new-onset localized headache, scalp or temporal artery tenderness or decreased pulsation, ischemia-related vision loss, or otherwise unexplained mouth or jaw pain on mastication) – Unequivocal symptoms of PMR, defined as shoulder and/or hip girdle pain associated with inflammatory stiffness	New-onset headache
	Temporal artery abnormality (tenderness to palpation or decreased pulsation)
At least one of the following: – TAB revealing features of GCA – Evidence of large-vessel vasculitis by angiography or cross-sectional imaging study such as MRA, CTA, or PET-CT	Positive TAB

CRP, C-reactive protein; CTA, computed tomography angiography; ESR, erythrocyte sedimentation rate; MRA, magnetic resonance angiography. ^aThe presence of ≥3 criteria classifies a patient as having GCA.