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What is a normal rheumatoid arthritis factor level?

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Quick Answer

Normal rheumatoid arthritis factor levels are reported as being lower than 40 to 60 units per millimeter, according to MedlinePlus. They also may be reported as a titer being less than 1:80. Most people with a low number do not have rheumatoid arthritis, but some develop it regardless.

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Abnormal results from the rheumatoid arthritis factor level test may indicate the person is at a higher risk of a number of conditions, including rheumatoid arthritis, states MedlinePlus. Most patients with rheumatoid arthritis have a high level of rheumatoid factor in their blood, but an individual may also have Sjogren's syndrome or other conditions such as scleroderma, adult Still's disease, sarcoidosis and dermatomyositis.

Those with other medical issues may also have higher rheumatoid arthritis factor levels, advises MedlinePlus. Individuals with viral conditions such as AIDS, influenza, infectious mononucleosis and hepatitis often have higher levels. People with certain kidney diseases, certain bacterial infections and parasite infections may also fall into this category. Chronic lung disease, liver disease and individuals with leukemia often have high rheumatoid arthritis factor levels as well. There are also cases where people who are perfectly healthy have high levels. Though these conditions may be associated with high rheumatoid arthritis factor levels, they cannot be diagnosed through this test.

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