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  • Title: A microassay for active and total renin concentration in human plasma based on antibody trapping.
    Author: Millar JA, Leckie BJ, Morton JJ, Jordan J, Tree M.
    Journal: Clin Chim Acta; 1980 Feb 14; 101(1):5-15. PubMed ID: 6987010.
    Abstract:
    We have developed and validated a new enzyme-kinetic method for measurement of renin concentration (PRC) in human plasma, based on radioimmunoassay of angiotensin I generated during incubation of plasma and excess sheep or ox renin substrate. Angiotensin I breakdown during incubation is prevented by the presence of anti-angiotensin I serum. The assya does not require prior extraction of renin, is technically simple, and is sufficiently sensitive to measure subnormal renin levels. With minor modifications both "active and "total" renin may be measured. Assay results have been calibrated with the International Standard Renin. PRC measured by this technique correlates significantly with angiotensin I and II, plasma renin activity, and with the PRC method previously used by us.
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