Table 2

Summary of specimens providing discrepant results. Cycle threshold (Ct) values are provided in parentheses where available

Specimen identifierSpecimen typeOriginal results: cobas 4800ReferenceRetesting results assays (C trachomatis only):
cobas 4800Reference
C trachomatis discrepant specimens:
AUrineNegPos (NA)Pos (36)Pos (37)
BUrineNegPos (41)NegNeg
CUrineNegPos (43)NegNeg
DUrineNegPos (42)NegNeg
EUrineNegPos (43)NegNeg
FUrinePos (36)NegPos (36)Pos (NA)
GUrinePos (36)NegPos (36)Pos (NA)
HVaginal swabNegPos (NA)Neg*Neg*
IVaginal swabNegPos (NA)Neg*Neg*
N gonorrhoeae discrepant specimens:
JUrineNegPos: AMP Pos; NG duplex - opa Pos (39), porA neg
KVaginal swabPos (39)Neg: AMP Pos; porALC neg
  • * The original phosphate-buffered saline suspension of these swabs was not available, therefore the remaining cobas PCR media suspensions of these specimens were used for retesting.

  • AMP, Roche AMPLICOR assay; NA, not available; Neg, Negative; porALC, porA LightCycler assay; Pos, positive.