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What does a rheumatoid arthritis blood test determine?

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A rheumatoid arthritis blood test may determine the concentration of rheumatoid factors that a patient has in his blood, as stated by WebMD. One common blood test for rheumatoid arthritis is the rheumatoid factor test.

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The rheumatoid factor blood test can determine whether or not a patient has the rheumatoid factor antibody in his blood. Approximately 70 to 90 percent of patients with rheumatoid arthritis have the rheumatoid factor in their blood, states WebMD. Doctors may also order the anti-CCP blood test in patients with rheumatoid arthritis. They use this blood test to determine how severe a person's disease may become.

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