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J Med Microbiol 57 (2008), 1220-1222; DOI: 10.1099/jmm.0.2008/001685-0
© 2008 Society for General Microbiology
ISSN 1473-5644

An evaluation of the recovery of mycobacteria from urine specimens using the automated Mycobacteria Growth Indicator Tube system (BACTEC MGIT 960)

Douglas Su Gin Chan{dagger}, May Yee Choy, Suxing Wang and Li-Hwei Sng

Central Tuberculosis Laboratory, Department of Pathology, Singapore General Hospital, Outram Road, 169608 Singapore

Correspondence
Li-Hwei Sng
sng.li.hwei{at}sgh.com.sg

Received 4 March 2008
Accepted 26 June 2008

The Mycobacteria Growth Indicator Tube (MGIT 960) system was evaluated against Lowenstein–Jensen (LJ) medium and the BACTEC 460 TB system for the recovery of mycobacteria from 1393 consecutive urine specimens. The MGIT had a sensitivity of 91.3 % [95 % confidence interval (CI), 83.2–99.4] when the combination of BACTEC 460 and LJ medium was used as the reference method. The mean time for positivity for MGIT and BACTEC 460 was 19.3 days and 20 days, respectively, while that for LJ medium was 35 days.The incidence of contamination was highest for LJ medium (n=148), followed by MGIT 960 (n=81), and BACTEC 460 had the lowest incidence of contamination (n=50). In conclusion, the isolation of mycobacteria from urine specimens by the MGIT 960 is comparable to that of the BACTEC 460 TB system and solid media.

Abbreviations: CI, confidence interval.

{dagger}Present address: National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074.






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