TABLE 4.

Resolution of discrepant results by arbitration

Drug (concn [μg/ml])No. of testsInitial resultArbitrated result
No. R by MGIT 960 but S by RRMNo. S by MGIT 960 but R by RRMNo. R by MGIT 960 and RRM (true resistant)No. S by MGIT 960 and RRM (true susceptible)No. R by MGIT 960 but S by RRMaNo. S by MGIT 960 but R by RRMb
AMI (1.0)130132911
CAP (1.25)7520322
OFL (1.0)0000000
PRO (2.5)9363123
PRO (5.0)3120012
RIFB (0.5)2020101
Total3492551469
  • a Classified as a false-resistant result (major error).

  • b Classified as a false-susceptible result (very major error).