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What are the drawbacks of rheumatoid factor used to diagnose rheumatoid arthritis?

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It misses 20% to 30% of cases of rheumatoid arthritis. It also shows up in other conditions, including:

It’s uncommon, but some healthy people can have rheumatoid factor in their blood test results.

  • Chronic hepatitis
  • Chronic viral infection
  • Dermatomyositis
  • Infectious mononucleosis
  • Leukemia
  • Scleroderma
  • Sjogren's syndrome
  • Lupus

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