Is rheumatoid factor 7 normal?
The “normal” range (or negative test result) for rheumatoid factor is less than 14 IU/ml. Any result with values 14 IU/ml or above is considered abnormally high, elevated, or positive.
What is the normal range for rheumatoid factor?
The normal range of RF is from 0-20 IU/ml. RF above 20 IU/ml is not considered enough to diagnose RA, as there other reasons the RF level may be elevated.
Is rheumatoid factor 10 normal?
Most medical centers consider the normal range of rheumatoid factor to be up to 10 IU/mL or 20 IU/mL, says rheumatologist Steffan Schulz, MD, assistant professor of clinical medicine with Penn Medicine in Philadelphia.
What does it mean if your rheumatoid factor is low?
A low number (negative result) most often means you do not have rheumatoid arthritis or Sjögren syndrome. However, some people who do have these conditions still have a negative or low RF. Normal value ranges may vary slightly among different laboratories.
What is a positive rheumatoid factor?
A positive rheumatoid factor test result indicates that a high level of rheumatoid factor was detected in your blood. A higher level of rheumatoid factor in your blood is closely associated with autoimmune disease, particularly rheumatoid arthritis.
Does everyone have rheumatoid factor?
What it means: About 70% to 90% of people with a high reading have RA. But people without RA can still have rheumatoid factor. In general, if you have RA but don’t have high RF, your disease will be less severe. RF levels may stay high even if you go into remission.
What is rheumatoid arthritis factor?
Rheumatoid factors are proteins produced by your immune system that can attack healthy tissue in your body. High levels of rheumatoid factor in the blood are most often associated with autoimmune diseases, such as rheumatoid arthritis and Sjogren’s syndrome.
What causes elevated rheumatoid factor?
A high level of rheumatoid factor can be caused by several autoimmune diseases (including rheumatoid arthritis) and some infections. Occasionally an elevated level of RF is present in healthy people.
What causes elevated RF?
High values. High RF levels may be caused by: Rheumatoid arthritis. Other autoimmune diseases, such as systemic lupus erythematosus (SLE), scleroderma, Sjögren’s syndrome, and vasculitis. Infectious diseases, such as tuberculosis, mononucleosis, syphilis, and malaria. Liver diseases, such as cirrhosis and hepatitis.
What is a high rheumatoid factor level?
High levels of rheumatoid factor (in general, above 20 IU/mL, 1:40, or over the 95th percentile; there is some variation among labs) occur in rheumatoid arthritis (present in 80%) and Sjögren’s syndrome (present in 70%). The higher the level of RF the greater the probability of destructive articular disease.
What are the levels of rheumatoid factor?
Most medical centers consider the normal range of rheumatoid factor to be up to 10 IU/mL or 20 IU/mL, says rheumatologist Steffan Schulz, MD, assistant professor of clinical medicine with Penn Medicine in Philadelphia. “If the range starts at 20 and the person has 22,…