HealthWise KnowledgeBase
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.
| By: | Reference Healthwise Staff | Last Revised: Reference June 4, 2012 |
| Medical Review: | Reference Anne C. Poinier, MD - Internal Medicine
Reference Kathleen Romito, MD - Family Medicine |
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