Multicenter evaluation of a new automated electrochemiluminescence immunoassay for the quantification of testosterone compared to liquid chromatography tandem mass spectrometry.

OBJECTIVES: A new electrochemiluminescence testosterone immunoassay (Elecsys® Testo II) was evaluated. DESIGN AND METHODS: Within-run precision, total precision, and method comparisons to the former immunoassay and LC-MS/MS were investigated. Reference intervals were established for adults and children. RESULTS: Imprecision ranged from 0.9% to 8.5%. Method comparisons revealed slopes from 0.68 to 1.32 and coefficients of correlation from 0.893 to 0.991. CONCLUSIONS: Improved agreement with LC-MS/MS was demonstrated, especially for female patients. The assay may be a suitable alternative for laboratories with no access to MS techniques.