Importance: GCA is a critically ischemic disease with protean manifestations that requires
urgent diagnosis and treatment. EULAR recommendations advocate ultrasonography as the
first line investigation for suspected GCA. Objective: Development of a GCA prediction tool
that sequentially combines the Southend GCA Probability Score (SGCAPS) with results of
quantitative ultrasonography. Design: A prospective, multi-center, longitudinal, inception
cohort (Halo Score in GCA; HAS-GCA) study of unselected consecutive patients with …

Background Giant cell arteritis is a critically ischaemic disease with protean manifestations
that require urgent diagnosis and treatment. European Alliance of Associations for
Rheumatology (EULAR) recommendations advocate ultrasonography as the first
investigation for suspected giant cell arteritis. We developed a prediction tool that
sequentially combines clinical assessment, as determined by the Southend Giant Cell
Arteritis Probability Score (SGCAPS), with results of quantitative ultrasonography. Methods …