Rheumatoid factor (RF) levels above a normal range can indicate autoimmune conditions, such as rheumatoid arthritis (RA). Rheumatoid factor (RF) is an immune system protein that attacks healthy cells.

Researchers’ understanding of the pathogenesis of rheumatoid arthritis has grown considerably in recent years, laying the ...

Your healthcare provider may also conduct blood tests to see if you have certain biomarkers (biological signs) for RA or inflammation, including rheumatoid factor, anti-citrullinated protein ...

The following is a summary of “Dual seropositive nonerosive lupus arthritis: rhupus or not?” published in the February 2025 ...

Medically reviewed by Anita C. Chandrasekaran, MD Pannus is the abnormal formation of tissues in joints most commonly ...

Each patient was also genotyped for markers in the HLA region and tested for two hallmarks of the disease: rheumatoid factor (RF) and antibodies to cyclic citrullinated peptides (CCP). Comparisons ...