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Interferon-gamma release assay as a diagnostic test for tuberculosis-associated uveitis
1Singapore National Eye Centre, National University of Singapore, Singapore, Singapore.
Eye (London, England)
|February 4, 2012
Summary
Diagnosing tuberculosis-associated uveitis (TAU) is improved by combining clinical signs with interferon-gamma release assay (IGRA) and tuberculin skin test (TST). Using both IGRA and TST together increases diagnostic accuracy for TAU.
Area of Science:
- Ophthalmology
- Infectious Diseases
- Immunology
Background:
- Tuberculosis-associated uveitis (TAU) diagnosis can be challenging.
- Interferon-gamma release assays (IGRAs) are increasingly used in TB diagnosis.
Purpose of the Study:
- To evaluate the diagnostic utility of interferon-gamma release assays (IGRAs) for tuberculosis-associated uveitis (TAU).
- To compare the sensitivity and specificity of T-SPOT.TB (an IGRA) and tuberculin skin test (TST) in diagnosing TAU.
Main Methods:
- Prospective cohort study of 138 patients with suspected TAU.
- Patients underwent T-SPOT.TB and TST testing.
- Diagnosis of TAU was based on clinical signs and exclusion of other causes.
Main Results:
- T-SPOT.TB showed higher specificity (75.0%) than TST (51.1%) for TAU diagnosis.
- TST demonstrated higher sensitivity (72.0%) compared to T-SPOT.TB (36.0%).
- Combining both tests improved diagnostic accuracy (AUC=0.665), with a 2.16-fold increased likelihood of TAU when both were positive.
Conclusions:
- A combination of clinical signs, IGRA (T-SPOT.TB), and TST is recommended for diagnosing TAU.
- Neither IGRA nor TST alone can exclude TAU if results are negative.
- Integrated diagnostic approaches enhance the accuracy of TAU detection.
