Discover what rheumatoid factor testing reveals about autoimmune conditions, how the test is performed, and what your results ...

Medically reviewed by Stella Bard, MD A rheumatoid factor (RF) test detects rheumatoid factor, a type of antibody (proteins that fight off harmful substances) in your blood. RF antibodies sometimes ...

Among patients with RA, ACPA status significantly modifies the relationship between BMI and cardiovascular risk.

Understanding the subtypes of juvenile idiopathic arthritis can help adult and pediatric rheumatologists manage patients ...

Across the globe, children with RF-negative polyarticular JIA exhibit differences in clinical features, disease activity, and treatment patterns.