Description
The Rheumatoid Factor test measures an antibody that supports the assessment of rheumatoid arthritis and related autoimmune conditions, helping guide diagnosis and care.
About the Rheumatoid Factor (RF) Test
This blood test measures Rheumatoid Factor (RF), an antibody often present in people with rheumatoid arthritis and some other autoimmune and inflammatory conditions. It is valuable for investigating joint pain, swelling and stiffness, particularly when autoimmune arthritis is suspected. Because RF can be positive in healthy people and negative in some with rheumatoid arthritis, it is interpreted by a doctor alongside symptoms and other tests.
Preparation and turnaround
A simple venous blood sample is taken with no fasting required. Results are usually available within one to two working days. RF is best interpreted by a doctor together with your symptoms and, often, other markers such as anti-CCP or inflammatory tests.
Frequently asked questions
Does a positive RF confirm rheumatoid arthritis?
Not on its own. RF can be positive in healthy people and negative in some with the condition, so it is interpreted alongside symptoms and other tests.
When is RF testing useful?
It helps investigate joint pain, swelling and stiffness, particularly when an autoimmune form of arthritis is suspected.
Is fasting required?
No fasting is needed for the Rheumatoid Factor test.
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