Rheumatoid Factor

Also known as: RF

Formal name: Rheumatoid Factor

At a Glance

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

This article was last reviewed on September 30, 2006. | This page was last modified on November 14, 2009.

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