Hello. Welcome to Ask The Doctor.
I understand your concern.
Rheumatoid Factor is a very non-specific test and has very low sensitivity and specificity in diagnosis of Rheumatoid Arthritis. It is just used as a screening test.
As far as your query is concerned, high cholesterol or blood fats will not cause any false positive test.
A number of conditions are associated with positive RF tests like Sjogren's syndrome or cryoglobulinemia, bacterial endocarditis, tuberculosis, sarcoidosis and malignancies. The prevalence of RF in healthy elderly patients may be as high as 10 percent.
So, for the confirmation of the diagnosis of Rheumatoid Arthritis, you would require to go for Anti-CCP Antibody test and tests are correlated with your clinical symptoms.
I hope the information helps you.
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