Rheumatoid factor less than 14 IU/mL. What is a normal rheumatoid factor level? What is the normal range of the RA factor? The normal range of rheumatoid factors in the blood is less than 14 IU/mL. Any values above 14 IU/mL suggest abnormal results, and the person might have rheumatoid arthritis, internal tissue injury, and inflammation Rheumatoid factors are proteins made by the immune system that can attack healthy tissue in the body. High levels of rheumatoid factor in the blood are most often related to autoimmune diseases, such as rheumatoid arthritis and Sjogren syndrome. However, rheumatoid factor may be detected in some healthy people. Revised criteria for the classification of rheumatoid arthritis (RA) : The new criteria are as follows: 1) Morning stiffness in and around joints lasting at least 1 hour before maximal improvement; 2) Soft tissue swelling (arthritis) of 3 or more joint areas observed by a physician; 3) Swelling (arthritis) of the proximal interphalangeal, meta
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