Topic: Temporal Arteritis
Subject: Medicine
A 70-year-old woman returns to the office because of aching and weakness in her arms to the point where she cannot lift her arm to brush her hair. Physical examination shows no muscle tenderness or other evidence of joint disease in both arms. The aching improves when she takes the prescribed nonsteroidal anti-inflammatory drug (NSAID). She also describes tenderness over the right temporal area of her scalp. Physical examination of the scalp shows no lesions.
Which of the following is the most appropriate next step?

A. Increase the dose of the NSAID

B. Order determination of erythrocyte sedimentation rate

C. Order determination of serum rheumatoid factor

D. Order x-ray films of the cervical spine

Please do not use chat terms. Example: avoid using "grt" instead of "great".