Rheumatoid Factor (RF)

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. Some people older than age 65 have a high RF level.
  • Having had multiple vaccinations or blood transfusions.
Author:
Healthwise Staff
Medical Review:
Anne C. Poinier, MD - Internal Medicine
Kathleen Romito, MD - Family Medicine
Last Updated:
June 4, 2012
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Topic Contents
Test Overview
Why It Is Done
How To Prepare
How It Is Done
How It Feels
Risks
Results
What Affects the Test
What To Think About
References
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