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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. Positive means you have high levels of rheumatoid factor.
The rheumatoid factor is an antibody present in the blood of many patients with rheumatoid arthritis. Doctors measure the level of rheumatoid factor by performing a blood test. A positive rheumatoid factor test means that the level of rheumatoid factor in the patient’s blood is considered to be high.
Rheumatoid factor (RF) levels above a normal range can indicate autoimmune conditions, such as rheumatoid arthritis (RA).
Let’s take a closer look at how levels of RF are determined, the role rheumatoid factor plays in a rheumatoid arthritis diagnosis, and other considerations when determining the cause of...
Normal levels for men range from 0-15 mm/hr to 0-20mm/hr and for women 0-20 mm/hr/ to 0-30mm/hr, depending on age – higher for people over the age of 50). The ESR rate is not specific for RA, and there are many factors that can interfere with the results, such as bad processing, an infection, and aging in patients over the age of 50.
A rheumatoid factor test measures the amount of rheumatoid factor in your blood. Rheumatoid factors are proteins made by your 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.
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.