TABLE 2.

Problems identified through the program between May 2010 and January 2011 from 45 instruments placed in the field and enrolled in the prequalification program

Problem reported	No. of instruments
Results flagged outside the acceptable statistical criteria	4
Failed the limit of the blank	2
Failed the bias	1
Target not detected in a positive sample	1
Instruments moved after initial verification due to laboratory renovations and were verified again before clinical sample testing	4
Instruments did not generate verification panel results due to run losses	12
Power outage	2
Instrument error	1
Transcription error	2
Incorrect carriers	1
Instrument alignment	1
Incorrect sample storage	1
Failed controls	1
Faulty thermocycler	1
Instrument replaced	2