Dermatologic Manifestations of Reactive Arthritis Workup
- Author: Robert A Schwartz, MD, MPH; Chief Editor: William D James, MD more...
Laboratory Studies
No laboratory or imaging finding is diagnostic of reactive arthritis. The diagnosis is based on clinical data.
Although a positive HLA-B27 result is not specific of the disease, haplotyping can be used to diagnose reactive arthritis.
Microbiologic examination of smears, immunofluorescence results, and cultures of the urethral secretion must be considered.
Microbiologic studies of urine and stool are less helpful; nevertheless, in the dysenteric form, stool culture for enteric pathogens (eg, Salmonella, Shigella, and Yersinia species) should be considered.
Aspirates of joint fluid usually are sterile.
A Japanese man with reactive arthritis was negative for HLA-B27 and other HLA-B27 cross-reactive major histocompatibility complex (MHC) class I antigens, but he was positive for human leukocyte antigen B51 (HLA-B51).[27] The laboratory examination findings showed significant elevation of serum levels of immunoglobulin G (IgG) and IgA antichlamydial antibodies.
A combination of Chlamydia infection and HLA-B51 presence was suggested to play a role in the pathogenesis of reactive arthritis in this patient. The US Preventive Services Task Force guidelines for screening for chlamydial infections were updated in 2007.[28]
Imaging Studies
Radiologic signs are present in only 40% of the cases. These signs can be completely absent regardless of the severity.
Whole-body scintigraphy is a sensible diagnostic tool for use in screening for enthesopathy and arthropathy.[29]
Other Tests
The incidence of reactive arthritis is high among patients with AIDS, and HIV testing is mandatory in patients in whom reactive arthritis is newly diagnosed, even if they do not have the risk factors.
Histologic Findings
Histopathologic changes are not different from the histopathologic picture of a psoriasis vulgaris. Acanthosis, with elongation of the rete ridges, psoriasiform hyperplasia, subcorneal abscesses, and spongiform pustules, are observed. The upper dermis shows a mixed inflammatory infiltrate with neutrophils.
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