A Chemiluminescent Immunoassay for Osteocalcin in Human Serum and a Solution to the "Hook Effect"
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A chemiluminescent immunoassay for human serum osteocalcin, or bone Gla protein, was established using a double-antibody sandwich model. Examination of the hook effect revealed that it was significantly reduced, and no hook effect was observed at an osteocalcin concentration of 4000 ng/mL. The established method showed good analytical performance and thermal stability. The limit of detection was 0.03 ng/mL. The intra-assay coefficient of variation (CV) was 3.22%-5.64%, the interassay CV was 4.42%-7.25%, and the recovery rate was 93.22%-107.99%. Cross-reactivity (CR) was not observed with bovine, rat, mouse, rabbit, or porcine samples. The developed method showed a good correlation with the N-MID product from Roche. In total, 1069 clinical patient samples were measured using the reagent kit developed in this study.
DOronzo S, Cives M, Lauricella E, Stucci S, Centonza A, Gentile M Clin Exp Med. 2024; 24(1):7.
PMID: 38240866 PMC: 10798926. DOI: 10.1007/s10238-023-01280-1.
Chang Q, Huang J, He L, Xi F Front Chem. 2022; 10:940795.
PMID: 36092672 PMC: 9458950. DOI: 10.3389/fchem.2022.940795.