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A normal, healthy amount of rheumatoid factor is less than 20 units per milliliter (<20 U/mL). Your provider might also refer to your test as being negative or positive. A negative result means you have a normal amount of RF in your blood.
A positive rheumatoid factor test result shows that you have a high level of rheumatoid factor in your blood. A higher level of rheumatoid factor in your blood is closely linked with autoimmune diseases, especially rheumatoid arthritis.
A positive rheumatoid factor test means that the level of rheumatoid factor in the patient’s blood is considered to be high. Rheumatoid factor was first described in connection to rheumatoid arthritis in 1940.
Rheumatoid factor is a blood test that helps to diagnose rheumatoid arthritis, lupus, and sarcoidosis. Elevated test results, or high levels, indicate severe disease. Learn about the normal range for rheumatoid factor.
Rheumatoid factor (RF) levels above a normal range can indicate autoimmune conditions, such as rheumatoid arthritis (RA). Rheumatoid factor (RF) is an immune system protein that attacks...
The rheumatoid factor or RF test is mostly used to diagnose rheumatoid arthritis. The test measures the amount of RF in your blood. It can also be used to detect other diseases like autoimmune disorders, juvenile arthritis, cancer, and infections.
Rheumatoid factor (RF) is an antibody in the blood often present in rheumatoid arthritis and some other autoimmune diseases, aiding in diagnosis.
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.
This test measures rheumatoid factors in a sample of your blood. High levels of rheumatoid factors may be a sign of rheumatoid arthritis or another autoimmune disease. Learn more.
A rheumatoid factor (RF) test is a blood test that's often used to help diagnose rheumatoid arthritis (RA). The test measures the amount of RF in your blood. High levels of RF in your blood indicate that you may have an autoimmune disease such as RA or Sjögren's syndrome .