Rheumatoid Factor (RF)

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Blood that is very high in fats.
• Age. About 5% to 10% of people older than age 65 have a high RF level.

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Author:	Sydney Youngerman-Cole, RN, BSN, RNC	Last Updated: June 16, 2006
Medical Review:	Kathleen Romito, MD - Family Medicine Stanford M. Shoor, MD - Rheumatology
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