What is the lab test that looks for a substance present in the blood of those who have rheumatoid arthritis?

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RF (Rheumatoid Factor) is the lab test that looks for a substance present in the blood of those who have rheumatoid arthritis. EMG (Electromyography) is a test used to evaluate muscle and nerve function. RA (Rheumatoid Arthritis) is a disease itself and cannot be a lab test. THR (Total Hip Replacement) is a surgical procedure for the treatment of hip joint arthritis.

What Is the Lab Test That Looks for a Substance