Is rheumatoid factor 15 IU ml normal?
Is rheumatoid factor 15 IU ml 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 RA factor normal range?
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.
How do you read rheumatoid factor results?
Normal Results If the result is above the normal level, it is positive. 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.
What does a rheumatoid factor of 20 mean?
As with rheumatoid factor, values >20 are normally considered positive; however, most RA patients will have strongly positive results (i.e., >60 units). Abnormally high values are associated with, but not diagnostic of RA. Reference ranges may vary but are often <0.6-0.8 mg/dl.
What does a rheumatoid factor of 60 mean?
If your level is lower than 60 U/mL, your results are considered negative and you likely don’t have RA. Levels above that may mean that you have RA or another autoimmune disease. The normal level for an older adult may be slightly higher than 60 U/mL.
What is a very high rheumatoid factor?
A person’s risk of developing rheumatoid arthritis typically increases with their RF level. The authors of the 2012 study report that a person with an RF level of 100 u/ml or higher may be up to 26 times more likely to develop rheumatoid arthritis than a person with an RF level of under 25 u/ml.
Is a rheumatoid factor of 25 high?
Normal ranges Some doctors define normal RF levels as 0–20 units per milliliter (u/ml) of blood. On the other hand, one 2012 study designated the upper limit of regular levels as 25 u/ml . A person’s risk of developing rheumatoid arthritis typically increases with their RF level.