Clinical Chemistry
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Clinical Chemistry 35: 2087-2092, 1989;
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Clinical Chemistry, Vol 35, 2087-2092, Copyright © 1989 by American Association for Clinical Chemistry

Solid-phase enzymoimmunoassay for osteocalcin in human serum or plasma, with use of a monoclonal antibody

MJ Power and PF Fottrell
Department of Biochemistry, University College, Galway, Ireland.

In this solid-phase enzymoimmunoassay on microtiter plates for osteocalcin in serum or plasma, we use an osteocalcin-horseradish- peroxidase conjugate and a monoclonal antibody raised against bovine osteocalcin. We thoroughly standardized the assay for measurement of osteocalcin in both serum and plasma, demonstrating independence of sample volume, and determining the analytical recovery and within-and between-assay CVs. The detection limit was between 0.6 and 1.1 micrograms/L and the ED50 was 16 micrograms/L for a 5-microL sample volume. The intra-assay CV over the range 3 to 74 micrograms/L was less than or equal to 15%. The interassay CV over the range 3.6 to 46 micrograms/L was less than or equal to 16%. Results by this assay and by an in-house radioimmunoassay in which the same monoclonal antibody was used correlated well (r2 = 0.948). Osteocalcin concentrations in serum and plasma as measured with the present assay agreed well with published values.




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Copyright © 1989 by the American Association for Clinical Chemistry.