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Results are usually reported in one of two ways:
- Less than 40-60 u/mL
- Less than 1:80 (1 to 80) titer
A low number (normal result) generally means you do not have rheumatoid arthritis or Sjogren syndrome. However, these conditions still can still occur in some people who have have a "normal" or low rheumatoid factor (RF).
Normal value ranges may vary slightly among different laboratories.
Rheumatoid factor (RF) blood tests measures the amount of the RF antibody in the blood.
The results of the rheumatoid factor (RF) test may be reported in titers or units:
A titer is a measure of how much the blood sample can be diluted before RF can no longer be detected. A titer of 1 to 20 (1:20) means that RF can be detected when 1 part of the blood sample is diluted by up to 20 parts of a salt solution (saline). A larger second number means there is more RF in the blood. Therefore, a titer of 1 to 80 shows more RF in the blood than a titer of 1 to 20.
Nephelometry units indicate how much light is blocked by the blood sample in the tube. A high level of RF causes the sample to be cloudy, so less light passes through the tube than when the RF level is low. So an RF level of 100 units is higher than one of 40 units.
Normal
Normal values vary from lab to lab. Results are usually available in a day or two.
Rheumatoid factor (RF) Titers
1:20 to 1:80 Units
14 units/mL to 60 units/mL
Patients should check with their heath profesional to see what the normal range is for the lab that tested your blood.
Rheumatoid factor is an immunoglobulin (antibody) which is able to bind to other antibodies. Rheumatoid factor is usually not found in the general population. it is only found in about 1-2% of healthy people. Rheumatoid factor increases with age and about 20% of people over 65 years old have an elevated rheumatoid factor.
A blood test is done to detect the presence of rheumatoid factor. This is normally ordered to diagnose rheumatoid Arthritis. Rheumatoid factor is present in 80% of adults who have rheumatoid arthritis The incidence of rheumatoid factor increases with duration time: at 3 months the incidence is 33%, at one year it is 75%. Up to 20% of rheumatoid arthritis sufferers remain negative for rheumatoid factor (also known as "seronegative rheumatoid arthritis") throughout their disease.
Results are usually reported in one of two ways:
Normal values are LESS than 60 U/ml.
A low number (normal result) usually means you do not have rheumatoid arthritis or Sjogren syndrome. However, some people who do have these conditions still have a "normal" or low rheumatoid factor (RF).
An RF of more than 23 units and a titer over than 1:80 can indicate rheumatoid arthritis but may also occur in other conditions.
A negative test result for rheumatoid factor does notnecesarily exclude the diagnosis of rheumatoid arthritis.
Rheumatoid factor
(RF) Titers Less than 1:80
Units Less than 60 units per milliliter (U/mL)
Check with your doctor to see what the normal range is for the lab that tested your blood.
High values
High RF levels may be caused by:
Rheumatoid arthritis. This is the most common reason for a positive rheumatoid factor (RF) level.
Hepatitis C infection.
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 chronic active hepatitis.
Infection of the heart (endocarditis).
Leukemia.
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What brings about rheumatoid factor?
At this stage the reason for rheumatoid factor is still unknown.
What do you mean by Rheumatoid arthritis factor?
Rheumatoid factor (RF or RhF) is an antibody that attacs an organism's own tissue. omos often found in About 80% of people with rheumatoid arthritis have detectable rheumatoid factor. Those who do not are said to be "seronegative".Rheumatoid factor can also be a (antibody that precipitates on cooling of a blood sample); it can be either type 2 (monoclonal IgM to polyclonal IgG) or 3 (polyclonal IgM to polyclonal IgG)
When reading lab results for Rheumatoid factor -5.0?
A rheumatoid factor over 23 units and a titer over 1:80 indicates rheumatoid arthritis, However this may also occur in other conditions.False positive results can occur when the blood is high in fats.A negative test result for rheumatoid factor does not exclude the diagnosis of rheumatoid arthritis.
What does a rheumatoid factor of 10.4 mean?
Results are usually reported in one of two ways:Less than 40-60 u/mLLess than 1:80 (1 to 80) titerA low number (normal result) usually means you do not have rheumatoid arthritis or Sjogren syndrome. However, some people who do have these conditions still have a "normal" or low rheumatoid factor (RF).Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What is a negative rheumatoid factor?
rheumatoid factor is a particular type of antibody that is found in about 80% of people have Rheumatoid arthritis as well as with other inflammatory illnesses. A negative RF simply means there is no RF in the blood.
Can you have rheumatoid arthritis with a rheumatoid factor of 20?
Yes, as a matter of fact you can have RA with no rheumatoid factor at all.
What brings about rheumatoid factor?
At this stage the reason for rheumatoid factor is still unknown.
What does a rheumatoid factor of 415 mean?
A rheumatoid factor test measures the amount of rheumatoid factor in your blood. 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. But rheumatoid factor may be detected in some healthy people, and people with autoimmune diseases sometimes have normal levels of rheumatoid factor.Results are usually reported in one of two ways:Less than 40-60 u/mLLess than 1:80 (1 to 80) titerA low number (normal result) usually means you do not have rheumatoid arthritis or Sjogren syndrome. However, some people who do have these conditions still have a "normal" or low rheumatoid factor (RF).Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.What Abnormal Results MeanAn abnormal result means the test is positive, which means higher levels of rheumatoid factor have been detected in your blood. Most patients with rheumatoid arthritis or Sjogren syndrome have positive RF tests.The higher the level, the more likely one of these conditions is present. There are also other tests for these disorders that help make the diagnosis.Not everyone with higher levels of rheumatoid factor has rheumatoid arthritis or Sjogren syndrome.Your provider may do another blood test (anti-CCP antibody) to help diagnose rheumatoid arthritis.People with the following diseases may also have higher levels of rheumatoid factor:SclerodermaSystemic lupus erythematosusAdult Still's diseaseDermatomyositisSarcoidosisHigher-than-normal levels of RF may be seen in people with other medical problems. However, these higher RF levels cannot be used to diagnose these other conditions:
Other associated names for rheumatoid factor?
It seems that rheumatoid factor is the only name that is used for it.
What do you mean by Rheumatoid arthritis factor?
Rheumatoid factor (RF or RhF) is an antibody that attacs an organism's own tissue. omos often found in About 80% of people with rheumatoid arthritis have detectable rheumatoid factor. Those who do not are said to be "seronegative".Rheumatoid factor can also be a (antibody that precipitates on cooling of a blood sample); it can be either type 2 (monoclonal IgM to polyclonal IgG) or 3 (polyclonal IgM to polyclonal IgG)
Can you have rheumatoid arthritis with a factor 11.5?
You can have it with or without any factor.
When reading lab results for Rheumatoid factor -5.0?
A rheumatoid factor over 23 units and a titer over 1:80 indicates rheumatoid arthritis, However this may also occur in other conditions.False positive results can occur when the blood is high in fats.A negative test result for rheumatoid factor does not exclude the diagnosis of rheumatoid arthritis.
What does a rheumatoid factor of 10.4 mean?
Results are usually reported in one of two ways:Less than 40-60 u/mLLess than 1:80 (1 to 80) titerA low number (normal result) usually means you do not have rheumatoid arthritis or Sjogren syndrome. However, some people who do have these conditions still have a "normal" or low rheumatoid factor (RF).Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What is a negative rheumatoid factor?
rheumatoid factor is a particular type of antibody that is found in about 80% of people have Rheumatoid arthritis as well as with other inflammatory illnesses. A negative RF simply means there is no RF in the blood.
How do you reduce rheumatoid factor?
no one knows.
Does Prednisone affect a rheumatoid factor test?
No.
Is a Rheumatoid Factor of 14 high enough to indicate RA?
It is possible to have RA without any Rheumatoid factor. This is known as seronegative RA. However if you are suspected of having RA then any RF (rheumatoid factor) helps complete the diagnosis towards the possibility of RA.
