Laboratory Implementation of the Polymerase Chain Reaction for Confirmation of Pulmonary Tuberculosis

Eur J Clin Microbiol Infect Dis. 1999 Jan;18(1):35-41. doi: 10.1007/s100960050223.

Abstract

Decision analysis methods were used to compare four mycobacteriology laboratory strategies with respect to time to confirmation and exclusion of smear-positive and smear-negative cases of pulmonary tuberculosis. Strategies assessed included the following: (i) polymerase chain reaction (PCR) on all respiratory specimens; (ii) PCR on smear-positive specimens and on the broth of vials for other specimens attaining a growth index >10 in a radiometric culture detection system; (iii) PCR on smear-positive specimens only; and (iv) radiometric culture detection, with DNA probe for species identification of vials attaining a growth index >999. Strategies i and ii had predicted average times to confirm cases of 5 and 7.6 days, respectively, and remained within 3 days of each other over a broad range of PCR performance with smear-negative specimens. In contrast, case-confirmation times using strategies iii and iv were 10.4 and 15.3 days, respectively. Only 10% of specimens were processed by PCR in strategy ii. Times to confirm smear-negative cases were comparable for strategies i and ii when PCR sensitivity was <40% with these specimens. Times to exclude pulmonary tuberculosis were similar for all strategies. Given the current suboptimal performance of PCR with smear-negative specimens, strategy ii offers accelerated case confirmation with limited PCR usage.

Publication types

  • Comparative Study

MeSH terms

  • Bacteriological Techniques
  • Clinical Laboratory Techniques
  • DNA, Bacterial / analysis
  • Decision Support Techniques
  • Humans
  • Mycobacterium tuberculosis / genetics*
  • Polymerase Chain Reaction*
  • Sensitivity and Specificity
  • Tuberculosis, Pulmonary / diagnosis*

Substances

  • DNA, Bacterial