Rheumatoid factor and ANA tests are generally negative in<unk>  JIA. Lab findings: anemia of chronic disease (can also appear in non-systemic types), neutrophilia, thrombocytosis, elevated acute phase reactants (ESR, CRP, ferritin).
Systemic-onset juvenile idiopathic arthritis
Juvenile idiopathic arthritis
Childhood arthritis
Sjögren–Larsson syndrome
Sjögren syndrome
Reactive arthritis
Psoriatic arthritis
CREST syndrome