Comparison of the BD Viper System With XTR Technology to the Gen-Probe APTIMA COMBO 2 Assay Using the TIGRIS DTS System for the Detection of Chlamydia trachomatis and Neisseria gonorrhoeae in Urine Specimens

Background: Performances of the BD ProbeTec Chlamydia trachomatis (CT)/Neisseria Gonorrhoeae (GC) Qx Amplified DNA Assay reagents on a BD Viper System with XTR Technology and APTIMA COMBO 2 Assay reagents on a TIGRIS DTS platform, for detection of both CT and GC were compared. Methods: A total of 1018 first-void urine specimens were tested for the presence of CT and GC DNA using the 2 assays. Results: CT was detected in 143 specimens (14%). Eight specimens exhibited discordant results, and they were divided equally between the 2 assays. Based on the original results, the overall agreement for CT was 99.2%, with 97.1% and 99.5% in agreement with positive and negative specimens, respectively. Cohen's Kappa was 0.967. GC was detected in 27 specimens (2.6%). Two specimens exhibited discordant results, and they were divided equally between the 2 assays. Based on the original results, the overall agreement was 99.8%, with 96.2% and 99.9% in agreement for positive and negative specimens, respectively. Cohen's Kappa was 0.961. Conclusions: There was a high level of agreement between the systems for both CT and GC detection.