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A rheumatoid factor (RF) blood test measures the amount of the RF antibody present 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. So a titer of 1 to 80 shows more RF in the blood than a titer of 1 to 20.
  • Nephelometry units show 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

The normal values listed here-called a reference range-are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

You can usually get the results within 24 hours.Rheumatoid factor (RF)Titers

Less than 1:80Units

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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Q: What does a rheumatoid factor of 189 mean?
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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 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.


Is 7 a factor of 189?

7 is a prime factor of 189, because 7 X 27 = 189.


Other associated names for rheumatoid factor?

It seems that rheumatoid factor is the only name that is used for it.


What is factor tree of 189?

it is the factors of 189


If your Rheumatoid factor is lower than the previous blood test what does this mean?

This is not known as the cause of it is unknown as well as the relationship between RF and the activity of the disease.


What is the greatest common factor of 81 and 189?

The greatest common factor of 81 and 189 is 27.


What is the greatest common factor of 189 and 449?

The Greatest Common Factor of 189 and 449 is 1.


What is the greatest common factor of 27 and 189?

Since 27 is a factor of 189, it is automatically the GCF.


What is the factor tree for 189?

189 63,3 21,3,3 7,3,3,3


What does the prime factor of 189 equal?

They are: 333*7 = 189