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Rheumatoid arthritis diagnosis

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2025 EULAR rheumatoid arthritis diagnosis clinical criteria referral anti CCP official

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Rheumatoid arthritis (RA) is diagnosed clinically: persistent inflammatory synovitis in a typical joint pattern, supported by blood tests and imaging, after excluding alternative causes. There is no single definitive test.

Typical clinical pattern

  • Painful, swollen, warm joints with morning stiffness lasting more than 30-60 minutes
  • Usually symmetric involvement of MCP and PIP joints of the hands, wrists, and MTP joints of the feet
  • DIP joints are usually spared
  • Symptoms often persist for at least 6 weeks, although early RA can occur before this
  • Systemic symptoms can include fatigue, low-grade fever, and weight loss
Objective joint inflammation, not pain alone, is required. Ultrasound or MRI can detect synovitis when the examination is uncertain. Goldman-Cecil Medicine, p. 2793.

Investigations

  1. Anti-CCP antibody / ACPA
    • Highly specific for RA, about 93-98% specificity.
    • Can precede clinical arthritis and predicts a higher risk of erosive disease.
  2. Rheumatoid factor (RF)
    • Present in about 75% of patients, but is not specific to RA.
    • May also occur with other autoimmune diseases, chronic infections, and in some healthy older adults.
  3. Inflammatory markers
    • ESR and CRP may be raised, but normal values do not exclude RA.
  4. Baseline tests and exclusion of mimics
    • CBC, liver and renal function
    • ANA only when another connective-tissue disease is suspected
    • Consider urate/crystal assessment, viral testing, or joint aspiration where clinically indicated.
  5. Imaging
    • Plain radiographs of hands and feet establish a baseline and may show periarticular osteopenia, joint-space narrowing, and erosions later.
    • Ultrasound or MRI is more sensitive for early synovitis and erosions.

2010 ACR/EULAR classification score

Apply this only in a patient with at least one clinically swollen joint and no better alternative diagnosis. A score of 6 or more out of 10 classifies definite RA:
DomainScore
Joint involvement0-5
RF and/or anti-CCP/ACPA0-3
Raised CRP or ESR0-1
Symptom duration 6 weeks or more0-1
Joint involvement carries the most weight: more small-joint synovitis gives a higher score. High-titre RF or anti-CCP gives 3 points. These are classification criteria and a diagnostic aid, not a replacement for clinical judgment. Goldman-Cecil Medicine, p. 2793.

Important differentials

  • Psoriatic arthritis
  • Osteoarthritis
  • Gout or CPPD disease
  • Systemic lupus erythematosus or other connective-tissue disease
  • Viral polyarthritis, such as parvovirus or hepatitis-associated arthritis
  • Septic arthritis, particularly if one joint is acutely hot, very painful, and associated with fever

When to refer urgently

Refer promptly to rheumatology for suspected persistent inflammatory arthritis, especially with small-joint swelling, positive anti-CCP/RF, or raised inflammatory markers. Early diagnosis matters because disease-modifying treatment is most effective before irreversible joint damage occurs. The recent referral-criteria systematic review also supports structured early identification and referral.
Seek same-day urgent assessment for a single hot swollen joint with fever, severe systemic illness, or immunosuppression, because septic arthritis must be excluded.
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