1. Rheumatoid Arthritis (RA) Test: Rheumatoid arthritis (RA) factor is a chronic symptomatic disease of unknown etiology. It is frequently characterized by swelling, pain in joints, by inflammatory and degenerative process involving cartilage and muscle tissues. Rheumatoid factors (RF) are a group of proteins present in the blood of the patient, suffering from rheumatoid arthritis. […]