Lab test
Rheumatoid Factor (RA) Test - Arthritis
A rheumatoid factor (RF) test measures autoantibodies that are often present in rheumatoid arthritis and some other conditions.
- Typical price
- From $198
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
A rheumatoid factor (RF) test measures autoantibodies that are often present in rheumatoid arthritis and some other conditions. It can include the IgM, IgA, and IgG forms of RF. Clinicians order it to help evaluate persistent joint pain, swelling, and stiffness, and to support assessment of inflammatory arthritis. A positive result is interpreted alongside symptoms and other tests such as anti-CCP.
What this test measures
- Rheumatoid factor IgM The most commonly measured RF isotype, often elevated in rheumatoid arthritis.
- Rheumatoid factor IgA An RF isotype that can be raised in some people with rheumatoid arthritis.
- Rheumatoid factor IgG An RF isotype that can also be elevated in rheumatoid arthritis.
Who this test may be right for
- People with persistent joint pain, swelling, or morning stiffness.
- Individuals with symmetric joint symptoms.
- Those being evaluated for inflammatory arthritis.
- People with a family history of rheumatoid arthritis.
- Anyone whose provider suspects an autoimmune joint condition.
Before your visit
- No fasting is required for rheumatoid factor testing.
- Take usual medications unless told otherwise.
- Tell the provider about joint symptoms and their duration.
- A standard blood draw is used for the sample.
- Share any history of autoimmune or inflammatory conditions.
Understanding your results
An elevated rheumatoid factor can be associated with rheumatoid arthritis and some other inflammatory or infectious conditions, while it can also be present in people without disease. The IgM, IgA, and IgG forms may be measured together, and results are interpreted with symptoms and tests such as anti-CCP. A negative result does not rule out arthritis. Discuss your result with a healthcare provider.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does an elevated rheumatoid factor indicate?
A high RF, especially IgM, can be associated with rheumatoid arthritis and other conditions, so it is interpreted with symptoms and additional tests.
Which RF types can be measured?
Rheumatoid factor IgM is most common, and IgA and IgG forms can also be measured.
Does RF testing require fasting?
No fasting is required for rheumatoid factor testing.
Can RF be positive without rheumatoid arthritis?
Yes. RF can be positive in other inflammatory or infectious conditions and even in some healthy people.
What does the Rheumatoid Factor (RA) Test - Arthritis measure?
Rheumatoid Factor (RF) is the autoantibody in rheumatoid arthritis (RA).
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Rheumatoid Factor (RA) Test - Arthritis results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
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