**3. Diagnosis of GCA**

Diagnosis of GCA is based on clinical and laboratory tests and application of the revised ACR criteria (**Table 1**) [17]. It has been suggested that in the presence of 3 points or more out of 11, with at least 1 point belonging to Domain 1, the diagnosis of GCA can be established.


*a In the presence of 3 points or more out of 11 with at least one point belonging to domain I along with all entry criteria, the diagnosis of Giant cell arteritis can be established.*

*b Exclusion criteria are including: ENT and eye inflammation, kidney, skin and peripheral nervous system involvement, lung infiltration, lymphadenopathies, stiff neck and digital gangrene or ulceration. c No other aetiologies can better explain any one of the criteria.*

*d -Enlarged and/or pulseless temporal artery: 1 point/tender temporal artery: 1 point.*

*e It must be ignored in the presence of PMR.*

*f Vascular and/or perivascular fibrinoid necrosis along with leucocyte infiltration: 1 point and granuloma: 1 point.*

#### **Table 1.**

*Revised ACR criteria (rACR) for diagnosis of GCAa [17].*
