**2.3 Investigations**

The following investigations are recommended in evaluation of suspected giant cell arteritis complete blood count, renal function tests, liver function tests, C-reactive Protein (CRP) and erythrocyte sedimentation rate (ESR) [1–5]. There is often evidence of an acute-phase response on blood tests. Other investigations recommended are Chest X-ray and urinalysis. Baseline (pre-treatment) markers of inflammation are also useful to assess response to treatment.

There are a number of investigations that can also be carried out to help confirm diagnosis, as outlined below.
