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

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. 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–H 2O 2 chemiluminescent system was chosen as the detection system. 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). The MPs-CLEIA provided apparent advantages over RIA, and facilitated the development of high-throughput screening and automated operation systems in clinical diagnosis.