rheumatoid factor-positive polyarticular juvenile idiopathic arthritis (Monarch Disease Ontology entry MONDO_0019435) is a category of juvenile idiopathic arthritis defined by the presence of arthritis affecting five or more separate joints during the first six months of disease, with positive serologic testing for rheumatoid factor. Also known as: juvenile idiopathic rheumatoid factor-positive polyarthritis, polyarthritis with rheumatoid factor, polyarticular JIA, RF+, polyarticular juvenile idiopathic arthritis, RF+, polyarticular juvenile idiopathic arthritis, rheumatoid Factor Positive, rheumatoid factor-positive polyarticular JIA.