Viral Arthritis Workup
- Author: Rabea Ahmed Khouqeer, MD, FRCP(C); Chief Editor: Herbert S Diamond, MD more...
Laboratory Studies
- Parvovirus B19: The incubation period is 7-18 days, and the state of viremia lasts 5-6 days.
- CBC count (to assess hemoglobin, neutrophils, lymphocytes)
- High immunoglobulin M antibody levels 4-6 days after the initial viremia
- Viral B19 DNA by polymerase chain reaction
- Immunoglobulin G antibody titer (of little diagnostic significance)
- Low-to-moderate titer values for rheumatoid factor, anti-DNA, antinuclear, and anticardiolipin antibodies possible in some patients
- Hepatitis A virus
- Elevated bilirubin and transaminases values
- Immunoglobulin M–specific anti–hepatitis A virus
- Hepatitis B virus
- Elevated bilirubin and transaminases values (may be normal in early stage of disease when arthritis is present)
- Serum hepatitis B surface antigen, hepatitis B early antigen, anti–hepatitis B surface antigen immunoglobulin M (indicates acute infection), viral DNA, polymerase
- Hepatitis C virus
- Elevated bilirubin and transaminase values (Normal transaminase levels do not exclude HCV infection.)
- Anti-HCV
- HCV-RNA by polymerase chain reaction methods
- Cryoglobulins, rheumatoid factor
- Rubella virus
- Anti–rubella virus immunoglobulin M (peaks 8-21 d after symptoms, then wanes by 5 wk)
- Anti–rubella virus immunoglobulin G (rises rapidly over a period of 1-3 wk and is of long duration)
- More recently, rubella virus has been isolated from lymphocytes and synovial fluid of patients who had vaccine-induced disease or who experienced rubella virus–associated arthritis years earlier.
- Alphaviruses: Diagnosis is confirmed by specific serology results.
- Human immunodeficiency virus: Generally, laboratory abnormalities are common but nonspecific in persons with HIV infection.
- Elevated levels of serum immunoglobulins, moderate elevation of erythrocyte sedimentation rate, circulating immune complexes, low-grade complement activation, low-titer antinuclear antibody, rheumatoid factor, false-positive test result for syphilis and anticardiolipin antibodies, and lupus anticoagulants
- CD8+ T cell and P-24 antigen possibly detected in synovial fluid.
- Human T-lymphotropic virus: HTLV-1 infection is diagnosed based on detection of antibodies with enzyme-linked immunosorbent assays, with confirmation by Western blot and the observation of "flower cells" on the peripheral smear.
Imaging Studies
Radiologic findings depend on the condition. Most of the virus-associated arthropathies are nonerosive and show only soft-tissue swelling. However, with HIV-related seronegative or psoriatic-type arthropathy, erosions, ankylosis, narrowing of joint spaces, whittling, osteolytic lesions, periostitis, sacroiliac joint-space widening, and syndesmophyte formation can be seen.
Procedures
Aspiration of the joint is useful to help rule out other conditions such as crystal arthropathy or bacterial infection.
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