Development of a rapid and sensitive magnetic chemiluminescent enzyme immunoassay for detection of luteinizing hormone in human serum

Objectives: A rapid and sensitive magnetic particles (MPs)-based chemiluminescence enzyme immunoassay (MPs-CLEIA) for determination of luteinizing hormone (LH) in human serum was developed and validated. Design and methods: The method was developed based on a sandwiched immunoreaction format, in which MPs served as both the solid phase and separator. The horseradish peroxidase(HRP)-luminol-H2O2 chemiluminescent system was chosen as the detection system. Results: This method had a detection limit of 0.2 mIU/mL and a linear range of 0.5-200 mIU/mL. The assay showed little cross-reactivity, and the intra-and inter-assay coefficients of variation were less than 10%. The recoveries were from 101.6% to 104.1%. The method has been successfully applied to detection of LH in human serum and showed good correlation compared with radioimmunoassay (RIA). Conclusion: The MPs-CLEIA provided apparent advantages over RIA, and facilitated the development of high-throughput screening and automated operation systems in clinical diagnosis. (C) 2009 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.