Scenario: (If a clinical vignette, then keep scenarios realistic and language naturalistic rather than technical)
A 27-year-old man was referred to a rheumatologist. He has been suffering from back, hip, sacrum, thoracic pain for several years. In the past, he felt pain inconstantly. Osteochondrosis was diagnosed, he was assigned to exercise, occasionally he took NSAIDs. In recent years, the pain has been intensified, and it mainly increases in the morning, diminishes after exercising and taking Diclofenac. Two months ago, he had left eye uveitis, and he was treated in hospital. There is no history of other diseases. During the physical examination, limited, painful movements of the lumbar spine (lateral flexion, forward flexion) were determined. There are no swollen joints, "old" sacroiliitis is observed in the pelvic radiograph. Ankylosing spondylitis was diagnosed.
What are the most appropriate blood tests to determine the inflammatory activity?
Select one of the following: