Comparative evaluation of CLIA and EIA for Quantiferon-TB Gold Plus.

The purpose of this study was to compare the Quantiferon-TB Gold Plus test analysed with chemiluminescence immunoassay (CLIA) to immunoassay (EIA). One hundred and twenty-five clinical specimens submitted to Karolinska University Hospital for Quantiferon-TB Gold Plus analysis were used to analyse agreement of the CLIA and EIA assays. The imprecision on CLIA was determined by analysis of pooled clinical samples of antigen tubes (TB1 and TB2), a reference material from National Institute for Biological Standards and Control (NIBSC 82/587) and two controls of the test.