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Molecular techniques in mycobacterial detection
1Department of Pathology, University of Texas Medical Branch-Galveston, Galveston, Tex 77555-0740, USA. gwoods@utmb.edu
Archives of Pathology & Laboratory Medicine
|January 11, 2001
Summary
Nucleic acid amplification (NAA) tests demonstrate excellent performance for detecting Mycobacterium tuberculosis complex in respiratory specimens. These tests offer rapid diagnosis, especially for smear-negative cases, potentially improving patient outcomes.
Area of Science:
- Microbiology
- Clinical Diagnostics
- Molecular Biology
Background:
- Mycobacterium tuberculosis complex (MTBC) detection is crucial for tuberculosis diagnosis.
- Nucleic acid amplification (NAA) tests offer a molecular approach for direct pathogen detection.
Purpose of the Study:
- To evaluate the clinical utility of commercial NAA tests for direct MTBC detection.
- To assess the performance of Amplified Mycobacterium Tuberculosis Direct Test and AMPLICOR Mycobacterium tuberculosis Test.
Main Methods:
- Systematic review of English-language literature.
- Analysis of sensitivity and specificity data for NAA tests.
Main Results:
- Both NAA tests show excellent performance (≥95% sensitivity, 100% specificity) in AFB smear-positive respiratory specimens.
- Gen-Probe assay is approved for all respiratory specimens, regardless of AFB smear status.
- In smear-negative cases, sensitivity ranged from 83-85% with 99% specificity for the Gen-Probe test.
Conclusions:
- NAA tests are reliable for rapid MTBC detection in respiratory and non-respiratory specimens, and positive cultures.
- Clinical utility is higher in smear-negative patients, enabling faster treatment and reduced invasive procedures.
- Further cost-effectiveness studies are needed to fully understand the impact on patient outcomes.