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Rheumatoid Factor

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Also known as: RF
Formal name: Rheumatoid Factor

At a Glance

Why Get Tested?

To help diagnose rheumatoid arthritis (RA)

When to Get Tested?

When you have joint pain and fatigue that your health care provider suspects may be due to RA

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?