Summary

Objectives: Evaluation and compare values ​​of MGIT, Xpert MTB/RIF and ZN for bronchoscopy bronchoscopic lavage for the diagnosis in sputum-smear negative pulmonary tuberculosis. Methods: Descriptive study at Thai Nguyen Tuberculosis and Lung Disease Hospital, from 1 / 2020-12 / 2020. There were 90 patients with suspected tuberculosis in sputum-smear negative or less sputum. MGIT, Xpert MTB/RIF and ZN of bronchoscopy bronchoscopic lavage. Results: MGIT assay against the standard with combined TB diagnosis had a sensitivity of 72.5%, a specificity of 71.4%, a positive predictive value of 89.3% and a negative predictive value 44,1%. The MGIT test against the Xpert MTB/RIF standard for TB diagnosis had a sensitivity of 64.3%, a specificity of 82.4%, a positive predictive value of 85.7% and a negative predictive value of 58.3%. Discussions: Together as were bronchoscopy bronchoscopic lavages, the TB diagnostic sensitivity of MGIT was always higher than ZN. Conclusions: Bronchoalveolar bronchial lavage MGIT test were more effective in diagnosing pulmonary tuberculosis than ZN in patients with suspected TB, in sputum-smear negative and less sputum.