Criteria
| Category | Primary clinical criteria | Diagnostic exclusions |
|---|
| Systemic arthritis | - Arthritis in one or more joints.
- Fever duration at least two weeks, quotidian pattern for three days.
- Requires one additional feature:
- Evanescent erythematous rash
- Generalized lymphadenopathy
- Hepatosplenomegaly
- Serositis
| - Psoriasis history.
- Human leukocyte antigen B27 positive male older than six years.
- Rheumatoid factor positivity.
|
| Oligoarthritis | - Affects one to four joints during first six months.
- Persistent subtype remains four or fewer joints.
- Extended subtype involves five or more joints after six months.
| - Psoriasis history.
- Human leukocyte antigen B27 positivity.
- Rheumatoid factor positivity.
- Systemic disease.
|
| Polyarthritis (Rheumatoid factor negative) | - Involves five or more joints during first six months.
- Rheumatoid factor tests negative.
| - Psoriasis history.
- Human leukocyte antigen B27 positivity.
- Systemic disease.
|
| Polyarthritis (Rheumatoid factor positive) | - Involves five or more joints during first six months.
- Two positive rheumatoid factor tests required.
- Tests performed at least three months apart.
| - Psoriasis history.
- Human leukocyte antigen B27 positivity.
- Systemic disease.
|
| Psoriatic arthritis | - Arthritis and psoriasis present.
- Alternatively, arthritis plus two features:
- Dactylitis
- Nail pitting or onycholysis
- Psoriasis in first-degree relative
| - Human leukocyte antigen B27 positivity.
- Rheumatoid factor positivity.
- Systemic disease.
|
| Enthesitis-related arthritis | - Arthritis and enthesitis present.
- Alternatively, arthritis or enthesitis plus two features:
- Sacroiliac joint tenderness
- Inflammatory lumbosacral pain
- Human leukocyte antigen B27 antigen
- Onset in male older than six years
- Acute anterior uveitis
- Relevant family history
| - Psoriasis history.
- Rheumatoid factor positivity.
- Systemic disease.
|
| Undifferentiated arthritis | - Fulfills criteria for no single category.
- Alternatively fulfills criteria for two or more categories.
| |
