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Tuberculosis in children: New diagnostic blood tests
Paediatrics & Child Health
|October 4, 2011
Summary
Interferon-gamma-release assays offer improved specificity over the tuberculin skin test for diagnosing latent tuberculosis infection (LTBI). These blood tests may enhance diagnosis in specific patient groups when used alongside the TST.
Area of Science:
- Immunology
- Infectious Diseases
- Clinical Diagnostics
Background:
- The tuberculin skin test (TST) for latent tuberculosis infection (LTBI) has limitations.
- Interferon-gamma-release assays (IGRAs) were developed as alternatives to TST.
- Two IGRAs are available in Canada: QuantiFERON-TB Gold In-Tube and T.SPOT-TB.
Purpose of the Study:
- To summarize IGRAs, their limitations, and clinical applications.
- To evaluate the role of IGRAs in diagnosing LTBI, particularly in pediatric populations.
- To compare the specificity and sensitivity of IGRAs versus TST.
Main Methods:
- Review of existing literature on IGRAs and TST.
- Analysis of performance data for QuantiFERON-TB Gold In-Tube and T.SPOT-TB.
- Assessment of diagnostic utility in various patient cohorts, including immunocompromised individuals and children.
Main Results:
- IGRAs demonstrate higher specificity compared to TST.
- Limited pediatric data exists for IGRA evaluation.
- IGRAs may be beneficial for TST-positive individuals at low LTBI risk.
- Combined IGRA and TST use may improve sensitivity in specific populations.
Conclusions:
- IGRAs represent a valuable diagnostic tool for LTBI, offering improved specificity.
- Further research is needed to address limitations, particularly in pediatric applications.
- IGRAs can complement TST, especially in high-risk or immunocompromised individuals.
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