Performances du test « Amplified Mycobacterium tuberculosis Direct Test » sur les échantillons respiratoires et extrarespiratoires

From March 1998 to December 2004, 3641 specimens (2427 respiratory samples and 1214 non-respiratory samples) collected from 2079 patients, were tested using the «Gen-Probe Amplified Mycobacterium tuberculosis Direct Test» (AMTD). After decontamination procedure every sample was testing by AMTD and by culture on solid and liquid media. The «Gold-standard» was considered by the combination of culture results and clinical diagnosis. Respiratory tuberculosis was present in 9,7% (127 patients), and non-respiratory tuberculosis was present in 18,9% (170 patients, mostly originated from Africa). Among the 2427 respiratory samples (197 culture positive samples, 211 AMTD positive) 225 corresponded to tuberculosis; for the 1214 non-respiratory samples (184 culture positive samples, 213 AMTD positive) 231 corresponded to tuberculosis. After resolving the discordant results, the sensitivity, specificity, positive and negative predictive values were 93.8, 100, 100, 99.4% respectively for respiratory samples and 92.2, 99.9, 99.5, 98% for non respiratory samples.