Rheumatoid factor (RF) is a blood test performed in patients with suspected rheumatoid arthritis (RA). It is an antibody against IgG, which is itself an antibody; RF and IgG form immune complexes, which are part of the disease process of various rheumatological diseases.

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... Why get tested?
To help diagnose rheumatoid arthritis (RA) and Sjögren’s syndrome

When to get tested?
If your doctor thinks that you have symptoms of RA or Sjögren’s syndrome

Sample required?
A blood sample drawn from a vein in your arm
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