Bronchoscopy in suspected pulmonary TB with negative induced-sputum smear and MTD® Gen-probe testing

Vivek N. Iyer, A. Y. Joshi, T. G. Boyce, M. W. Brutinel, M. C. Scalcini, J. W. Wilson, Kevin McCoy, T. R. Aksamit

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Introduction: In our institution, patients with suspected pulmonary TB undergo multiple induced-sputum sampling for microscopy, culture and nucleic acid amplification (NAA) with the MTD® Gen-probe assay. Those with negative induced-sputum results still suspected with TB are then referred for bronchoscopy. We sought to determine the diagnostic yield of bronchoscopy in these patients with negative initial induced-sputum results both via smear and NAA testing. Methods: We identified 30 consecutive cases of suspected pulmonary TB between 2001 and 2007, who had undergone a diagnostic bronchoscopy after negative results on induced-sputum smears and the MTD® Gen-probe on at least 2 samples. Results: The cohort (M = 20 & F = 10) had a median age of 37 (range 16-85 yrs); were predominantly foreign born (27/30); HIV-negative (29/30) individuals with strongly positive TST's (mean 18 + 5 mm). Induced-sputum cultures were negative for M-TB in all patients after a full 60-day incubation period. BAL was culture positive for M-TB in 3/30 cases (10%) with 2 strains being pan-sensitive and the third being INH resistant. BAL microscopy with acid-fast smear (n = 30) and BAL Gen-probe (n = 23) were negative in all cases. A third of the patients (9/27, 33%) with negative bronchoscopy results were treated for culture negative TB. Treatment for latent TB was initiated in 5/27 (18%) individuals whereas 13/27 (48%) received no further treatment. Conclusion: Bronchoscopy provided diagnostic confirmation of pulmonary TB in 10% of subjects at least 2 negative induced-sputum samples by smear microscopy and NAA testing.

Original languageEnglish (US)
Pages (from-to)1084-1090
Number of pages7
JournalRespiratory Medicine
Issue number7
StatePublished - Jul 2011


  • Bronchoscopy
  • Nucleic acid amplification (NAA)
  • Tuberculin skin test (TST)
  • Tuberculosis (TB)

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine


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