Polyarticular Juvenile Idiopathic Arthritis, Rheumatoid Factor Negative

**Semantic type:** Disease or Syndrome

**Definition:** 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 negative serologic testing for rheumatoid factor.

**Synonyms:** - Juvenile rheumatoid polyarthritis (seronegative) - Polyarticular JIA, RF- - Polyarticular JIA, RF- - Polyarticular Juvenile Idiopathic Arthritis, RF- - Polyarticular Juvenile Idiopathic Arthritis, RF-