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The performance characteristics of the Gen-Probe Probe Competition Assay (PCA) used in conjunction with the Gen-Probe PACE 2 and 2C direct detection assays for Chlamydia trachomatis were examined. Data collected by five public health laboratories by using the Gen-Probe PACE 2 were pooled and analyzed. Of 25,081 endocervical and male urethral specimens tested by the PACE 2 assay, 773 were tested by PCA. Of 334 specimens initially positive by the PACE 2 assay with an initial PACE 2 result of greater than 2,000 relative light units (RLU), 333 (99.7%) were positive by PCA while 242 of 339 (71.4%) specimens with an initial result between the cutoff and 2,000 RLU were positive by PCA, and 35 of 100 (35%) specimens with initial results between 200 RLU and the cutoff were positive by PCA. An additional 10,938 specimens were tested by the PACE 2C assay. Of these, positive PCA results were obtained for 187 of 188 (99.5%) specimens with initial results of greater than 2,000 RLU, 99 of 163 (60.7%) of specimens in the range of cutoff to 2,000 RLU, and 12 of 100 (12%) in the range of 200 RLU to the cutoff. These results indicate that specimens greater than 2,000 RLU do not require a supplemental test and that additional positive results can be obtained by testing specimens with an initial result below the cutoff.

journal of clinical microbiology

Performance characteristics of the Gen-Probe Probe Competition Assay used as a supplementary test for the Gen-Probe PACE 2 and 2C assays for detection of Chlamydia trachomatis