Individual test · Labcorp 006502

Rheumatoid Factor (RF)

This test measures the level of rheumatoid factor, a protein produced by your immune system that can mistakenly attack healthy body tissue. It helps show whether symptoms like joint pain, stiffness, or swelling may be caused by an autoimmune reaction rather than general wear and tear. Doctors use these results to help distinguish rheumatoid arthritis from other types of joint disorders or inflammatory conditions. However, a high level does not confirm a diagnosis by itself, as elevated results can also appear in other infections or even in healthy people.