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Year : 2022  |  Volume : 11  |  Issue : 4  |  Page : 310-313

Diagnostic yield of direct smear, concentrated smear, liquid culture, and GeneXpert by sputum induction in smear-negative pulmonary tuberculosis patients

1 Department of Chest Medicine, Government Mohan Kumaramangalam Medical College, Salem, Tamil Nadu, India
2 Department of Chest Medicine, Saveetha Medical College, Chennai, Tamil Nadu, India
3 Department of Chest Medicine, Kanyakumari Government Medical College, Nagercoil, Tamil Nadu, India

Correspondence Address:
Dr. P Anandeswari
308/122a, Nesalvar Colony Road, Dadagapatty Gate, Salem - 636 006, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijrc.ijrc_33_22

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Background: Spontaneous sputum smear gave negative results in clinically and radiologically suspected pulmonary tuberculosis (TB) patients. Hence, the study aimed to evaluate the diagnostic yield of induced sputum with direct smear, concentrated smear, liquid culture, and GeneXpert. Materials and Methods: This cross-sectional study was conducted on clinically and radiographically suspected TB patients who were sputum smear-negative; 88 sputum smear-negative patients underwent sputum induction, and the samples were tested for direct smear, concentrated smear, liquid culture, and GeneXpert. Descriptive analysis was carried out for frequency and proportion for categorical variables and mean and standard deviation for quantitative variables. Diagnostic yield was calculated for each test. Data analyzed using coGuide software, V.1.03. Results: The mean age of the study population was 46.87 ± 15.09 years, and male participants were the majority. The diagnostic yield of induced sputum was 19.29% compared to a direct smear. Diagnostic yield was 59.25%, 80.70%, and 94.73% for concentrated smears, liquid culture, and GeneXpert, respectively. Conclusion: Induced sputum gave a high diagnostic yield in smear-negative pulmonary TB. With induced sputum, GeneXpert gave maximum yield compared to direct smear, concentrated smear, and liquid culture.

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