Problem: A 74-year-old patient presents to the emergency department with left temporal headache and partial painless vision loss in her left eye. On exam, she has tenderness over the temporal artery and you are concerned about giant cell arteritis (temporal arteritis). Which of the following diagnostic tests would be most helpful to support this diagnosis? Need Assignment Help? Antinuclear antibody Intrinsic factor antibody Rheumatoid factor Erythrocyte sedimentation rate