Three of the following five criteria were required to meet American College of Rheumatology (ACR) classification criteria for giant-cell arteritis:

1. Age 50 years or older,
2. New-onset localized headache,
3. Temporal artery tenderness or decreased temporal artery pulse,
4. Erythrocyte sedimentation rate of at least 50 mm/h, and
5. Abnormal artery biopsy specimen characterized by mononuclear infiltration or granulomatous inflammation.

These criteria have a reported sensitivity of 93.5% and a reported specificity of 91.2% for the classification of giant-cell arteritis compared with other vasculitides.

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