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Pulmonary Tuberculosis IV

Pulmonary Tuberculosis IV

Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...

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Updated: Jun 13, 2025

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

Published on: April 9, 2012

Accelerating extrapulmonary tuberculosis diagnosis with a rapid molecular assay.

Christelle Guillet-Caruba^1,2, Caroline Bénet^1,2, Haroun Jmel¹

¹AP-HP Université Paris-Saclay Hôpital Antoine Béclère, Service de Bactériologie-Hygiène, Clamart, France.

Microbiology Spectrum

|June 12, 2025

Summary

Systematic nucleic acid amplification testing (NAAT) for extrapulmonary tuberculosis (EPTB) significantly speeds up diagnosis. This rapid molecular test accelerates EPTB diagnosis by an average of 16 days compared to conventional methods.

Keywords:

Mycobacterium tuberculosis Xpert MTB/RIF Ultra extrapulmonary tuberculosis lymph node tuberculosis molecular methods nucleic acid technology rifampin resistance time to result

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Area of Science:

Microbiology
Infectious Diseases
Molecular Diagnostics

Background:

Extrapulmonary tuberculosis (EPTB) presents diagnostic challenges due to low bacterial load and atypical symptoms.
Conventional diagnostic methods for EPTB often have long turnaround times, delaying treatment initiation.

Purpose of the Study:

To evaluate the benefits of systematically using nucleic acid amplification tests (NAAT) for diagnosing EPTB in a developed country.
To assess the time savings and diagnostic performance of reflex NAAT on extrapulmonary specimens.

Main Methods:

A prospective study from November 2017 to March 2021 included 691 extrapulmonary samples.
Samples were tested using both conventional methods and Xpert MTB/RIF Ultra (NAAT).
Time to results and diagnostic performance metrics were evaluated.

Main Results:

Nucleic acid amplification test (NAAT) identified 85 (12.3%) positive samples for Mycobacterium tuberculosis complex.
NAAT results were available in an average of 1.3 days, compared to 18 days for culture, accelerating diagnosis by 16 days.
Overall NAAT sensitivity was 87.9% and specificity was 94.6%, with low invalid result rates (0.9%).

Conclusions:

Systematic use of NAAT offers a rapid and consistent diagnostic approach for EPTB.
This molecular test can significantly accelerate EPTB diagnosis and treatment initiation, days to weeks earlier than culture.
NAAT provides a valuable tool for timely management of extrapulmonary tuberculosis.