Ophthalmologic Manifestations of Reactive Arthritis Workup
- Author: Mounir Bashour, MD, CM, FRCS(C), PhD, FACS; Chief Editor: Hampton Roy Sr, MD more...
Laboratory Studies
- Cultures
- If urethritis or cervicitis is present, cultures should be obtained. Smears of urethral discharge may be sent for antichlamydial staining by direct immunofluorescent antibody, enzyme immunosorbent assay, culture, or nucleic acid probe. A Giemsa stain or a Wright stain may reveal the classic gram-negative intracellular diplococci associated with gonorrhea. Many patients may experience simultaneous sexually transmitted diseases, particularly chlamydia and gonorrhea.
- Results of routine urine cultures are negative.
- Stool cultures can be helpful for enteric pathogens.
- Venereal Disease Research Laboratory (VDRL) test and fluorescent treponemal antibody absorption (FTA-ABS) test: Perform serologic testing to rule out syphilis that may be associated with chlamydial infection.
- Synovial fluid aspirates and synovial biopsy samples show a nonspecific mixed inflammatory reaction. Rarely, gonococcus may be recovered.
- The erythrocyte sedimentation rate and the C-reactive protein level may be elevated.
- Rheumatoid factor and antinuclear antibodies are negative.
- HLA-B27
- HLA-B27 antigen testing is not diagnostic but may be useful.
- The HLA-B27 test is moderately expensive and should not be ordered indiscriminately as a screen for all patients with uveitis. Instead, this test should be ordered for patients suspected of having ocular disease associated with one of the seronegative spondyloarthropathies.
- A complete histocompatibility panel, which includes multiple loci and alleles, is not necessary. This test can be exorbitantly expensive, and it is not useful in the workup of patients with uveitis.
- A tuberculin skin test may be appropriate in certain individuals, particularly those with demographics strongly suggestive of infectious tuberculosis (TB). TB is far more likely to occur in immigrants from Southeast Asia, Africa, and other endemic regions. Caution must be taken not to interpret a positive skin test as diagnostic of tuberculous uveitis, particularly in individuals who have been given the bacille Calmette-Guérin (BCG) vaccine.
Imaging Studies
- Radiologic examination demonstrates various arthritic changes.
- Changes in the sacroiliac joint are present in as many as 32% of patients.
- Specifically ordering a radiograph of the sacroiliac joint is best. This radiograph provides a more sensitive tunnel view compared to a routine film of the lumbosacral spine.
- Films of the foot may be useful, revealing changes consistent with chronic plantar fasciitis or Achilles tendonitis.
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