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Abstract Objective：To study the application of mycobacterium tuberculosis-DNA in BALF by FQ-PCR for the diagnosis of pulmonary.Method：110 cases with tuberculosis in our hospital were randomly selected from December 2013 to November 2014 as the objects of the study， all patients were given the fiberoptic bronchoscopy， biopsy， brush biopsy，mycobacterium tuberculosis DNA in bronchoalveolar lavage fluid（ BALF） was detected by FQ-PCR，the examination results were analyzed. Result： In this study，44 cases of pulmonary tuberculosis， accounted for the proportion to 40.00%（44/110）；the sensitivity of FQ-PC detection was significantly higher than that of conventional smear microscopy，the difference was statistically significant（P<0.05）. Conclusion：In the diagnosis of pulmonary tuberculosis，the FQ-PCR detection has high sensitivity， simple operation and the detection speed faster，it is an important examination method of mycobacterium tuberculosis DNA in BALF and has important application value.
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