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Q:
Alyssa from Edmonton asks: What type of inflammatory arthritis occurs in multiple joints and yet shows negative on blood tests for the RA factor?
In many cases, inflammatory arthritis is a clinical diagnosis, meaning it can be diagnosed by listening to the patient’s story and performing an appropriate physical examination. Rheumatoid arthritis can be associated with a number of positive blood tests, including a rheumatoid factor or anti-CCP-antibody, but a negative test does not exclude the diagnosis. Other forms of inflammatory arthritis that usually have negative blood tests include psoriatic arthritis, enteropathic arthritis, and reactive arthritis.