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Related Concept Videos

Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

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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.
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Pulmonary Tuberculosis V01:28

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Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Sputum studies are a critical part of diagnosing and treating numerous respiratory conditions. These studies involve obtaining sputum samples for analysis to identify pathogenic organisms and assess the presence of abnormal cells indicative of malignant conditions. This lesson will delve into three fundamental sputum studies: Gram Stain, Cytology, and Acid-fast Smear and Culture.
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Description
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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
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Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
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Diagnosing pulmonary tuberculosis by pooling induced sputum.

Mei Ying Chew1,2, Jeffrey Ng1,2, Tow Keang Lim1,2

  • 1Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Hospital, Singapore.

Journal of Clinical Tuberculosis and Other Mycobacterial Diseases
|November 14, 2019
PubMed
Summary

Pooling two induced sputum specimens for a single microbiological test offers high accuracy for diagnosing pulmonary tuberculosis (PTB). This method is comparable to repeat testing, improving efficiency in PTB diagnosis.

Keywords:
DetectionInduced sputumReduce transmissionsSmear negative

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Area of Science:

  • Medical Diagnostics
  • Microbiology
  • Pulmonology

Background:

  • Early diagnosis and treatment of pulmonary tuberculosis (PTB) are crucial for reducing transmission and mortality.
  • Sputum induction is recommended for diagnosing PTB in patients unable to expectorate or with negative smear results.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of pooling two induced sputum specimens for PTB diagnosis in a single day.
  • To assess the utility of combined sputum testing for microbiological analysis.

Main Methods:

  • Prospective enrollment of hospitalized adults with suspected PTB (2009-2016).
  • Collection of two induced sputum specimens on the same day, pooled for AFB smear, culture, and Xpert MTB/RIF testing.
  • Final PTB diagnosis based on positive respiratory culture; 3-month patient follow-up.

Main Results:

  • 86 of 420 (20.5%) patients were diagnosed with PTB.
  • Pooled induced sputum demonstrated high diagnostic accuracy: sensitivity 98.8%, specificity 100%, positive predictive value 100%, and negative predictive value 99.7%.
  • Xpert MTB/RIF on pooled sputum was positive in 88.4% of PTB patients.

Conclusions:

  • Testing pooled induced sputum specimens for microbiological analysis is a potentially effective strategy for PTB diagnosis.
  • This method may offer comparable accuracy to repeat testing, enhancing diagnostic efficiency.