HBV DNA Quantification
Within scope of accreditation
To assess treatment outcomes for patients infected with Hepatitis B virus
PURPOSE OF PROGRAMME:
To provide EQA for laboratories determining levels of HBV DNA
PROGRAMME OF ANALYSIS:
Results are entered online via the UK NEQAS secure website. The distribution is open for three weeks. Intended results are usually uploaded the day after closing date. Late results are not accepted after intended results are uploaded.
The report displays absolute quantitation data (log) for each specimen reported by method; this data includes the number of users, range, median concentration and values at 5%, 95% percentiles. For performance assessment the uncertainty of the median difference of the participants’ results is calculated to confirm the appropriateness of applying the assessment criterion. ISO 13528 states the uncertainty should be less than/equal to 0.3 of the SD for PT (when the participant SD is used as the assigned value).This scheme uses a fixed value based on the technical limitations of testing. The uncertainty of the median difference is checked to confirm it is less than 0.09 (0.3 x the fixed value). General descriptive statistics.
Consensus. Participants are assessed on their ability to report to within a fixed value of the average of assay medians log difference in results reported between the two specimens (assessment criterion). For HBV from April 2011 this fixed value is 0.3 log. Also see scoring policy
PERSISTENT POOR PERFORMANCE:
See the Annual Directory for UK and Irish participants only
The first distribution of UK NEQAS for Microbiology was sent out by the then Public Health Laboratory Services on the 1st of May 1971 organised by Dr Peter Crone. This distribution consisted of one scheme, three bacteriology specimens, sent to 67 laboratories in the UK. One of our recent distributions consisted of 12 different schemes, comprising 8 bacteriology, 13 serology, 10 molecular and 9 mycology specimens, and sent to 53 countries representing over 1300 laboratories. UK NEQAS for Microbiology, operated by Public Health England, is a UKAS accredited proficiency testing provider No. 4715.