Table 1.
Rheumatoid factor frequency in different diseases and conditions.
| Disease | Frequency, % |
|---|---|
| Arthritis | |
| Rheumatoid arthritis | 70–90 |
| Juvenile idiopahtic arthritis | 5 |
| Psoriatic arthritis | <15 |
| Reactive arthritis | <5 |
| Other connective tissue diseases | |
| Primary Sjgren's syndrome | 75–95 |
| Mixed connective tissue disease | 50–60 |
| Systemic lupus erythematosus | 15–35 |
| Systemic sclerosis | 20–30 |
| Dermato-/polymyositis | 20 |
| Systemic vasculitides (panarteritis nodosa, Wegener's granulomatosis) |
5–20 |
| Infectious diseases | |
| Bacterial infections | |
| Subacute bacterial endocarditis | 40 |
| Chlamydia pneumoniae infection | |
| Klebsiella pneumoniae infection | |
| Syphilis primary-tertiary | 8–37 |
| Tuberculosis | 15 |
| Viral infections | |
| Coxsackie B virus infection | 15 |
| Dengue virus infection | 10 |
| EBV and CMV infections | 20 |
| Hepatitis A, B and C virus infection | 25 |
| HCV infection | 40–76 |
| Herpes virus infection | 10–15 |
| HIV infection | 10–20 |
| Measles | 8–15 |
| Parvovirus infection | 10 |
| Rubella | 15 |
| Parasitic | |
| Chagas | 15–25 |
| Malaria | 15–18 |
| Onchocerciasis | 10 |
| Toxoplasmosis | 10–12 |
| Other diseases | |
| Mixed cryoglobulinemia type II | 100* |
| Liver cirrhosis | 25 |
| Primary biliary cirrhosis | 45–70 |
| Malignancy | 5–25 |
| After multiple immunisations | 10–15 |
| Chronic sarcoidosis | 5–30 |
| Healthy 50-year olds | 5 |
| Healthy 70-year olds | 10–25 |