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