Related Experiment Video
Updated: Feb 27, 2026
Identification of Mycobacterium Species by DNA Microarray Chip Method
Published on: June 24, 2025
[Diagnostic value of different detection methods for Mycobacterium tuberculosis in bronchoalveolar lavage fluid from
Shali Jiang1, Weijun Liang2, Demao Zhu3
1Department of Pathology, Changsha Central Hospital, Changsha 410004, China 943202965@qq.com.
Insights
The membrane reverse dot blot (RDB) method offers superior diagnostic accuracy for detecting Mycobacterium tuberculosis in bronchoalveolar lavage fluid compared to smear and PCR. RDB also rapidly identifies drug resistance genotypes.
Area of Science:
- Medical Diagnostics
- Microbiology
- Pulmonary Medicine
Background:
- Pulmonary tuberculosis diagnosis relies on detecting Mycobacterium tuberculosis.
- Existing methods like smear microscopy and PCR have limitations in sensitivity and speed.
- Accurate and rapid diagnostic tools are crucial for effective tuberculosis management.
Purpose of the Study:
- To evaluate and compare the diagnostic performance of BALF smear, PCR, and RDB for Mycobacterium tuberculosis.
- To assess the utility of RDB in identifying drug resistance genotypes.
Main Methods:
- Bronchoalveolar lavage fluid (BALF) samples were collected from 100 patients.
- Samples were analyzed using BALF smear microscopy, polymerase chain reaction (PCR), and membrane reverse dot blot (RDB).
- Diagnostic parameters including sensitivity, specificity, and accuracy were calculated for each method.
Main Results:
- RDB demonstrated the highest positive rate (92.31%) compared to PCR (73.84%) and smear (43.08%).
- RDB achieved superior sensitivity (92.31%) and accuracy (95.00%), with 100% specificity.
- RDB also identified resistance to streptomycin, rifampicin, and isoniazid.
Conclusions:
- Membrane RDB is a highly sensitive and specific method for diagnosing Mycobacterium tuberculosis in BALF.
- RDB offers rapid identification of drug resistance, enhancing its clinical value for tuberculosis treatment.
Objective:
To investigate the diagnostic value of different detection methods for Mycobacterium tuberculosis in bronchoalveolar lavage fluid (BALF) from patients with pulmonary tuberculosis. Methods: BALF from100 patients in Changsha Central Hospital from January 2013 to December 2015 was collected. Among 100 patients, 65 cases were clinically diagnosed as tuberculosis, and 35 cases served as control. BALF smear method, polymerase chain reaction (PCR) and membrane reverse dot blot (RDB) were used for synchronous detection of Mycobacterium tuberculosis. Results: The positive rates by BALF smear method, PCR and RDB were 43.08%, 73.84% and 92.31%, respectively (P<0.05). Sensitivity, specificity, accuracy, and negative predictive value for BALF smear were 43.08%, 88.57%, 59.00%, and 45.59%, respectively; for PCR were 73.85%, 100%, 83.00%, and 67.31%, respectively; for RDB were 92.31%, 100.00%, 95.00%, and 87.50%, respectively. Conclusion: The technique of membrane RDB can not only accurately diagnose Mycobacterium tuberculosis, but also can rapidly and easily identify the resistance of Mycobacterium tuberculosis to streptomycin (SM), rifampicin (RFP) and isoniazid (INH) genotypes. It possesses high clinical value.
