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Clinical Chemistry 35: 1431-1434, 1989;
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Clinical Chemistry, Vol 35, 1431-1434, Copyright © 1989 by American Association for Clinical Chemistry

Improved radioimmunoassay of atrial natriuretic peptide in plasma

C Poiesi, A Rodella, G Mantero, G Cannella, R Ferrari and A Albertini
Department of Chemistry, School of Medicine, University of Brescia, Italy.

We describe a radioimmunoassay (RIA) for measurement of atrial natriuretic peptide (ANP), based on one-step incubation and a simplified extraction procedure. The extraction was performed on a "Supelclean LC 18" column, with 2-mL plasma samples. Use of a diiodinated tracer improved the sensitivity of the RIA method. The minimal detectable value was 5 ng/L. Simplification of the extraction procedure and simultaneous incubation of the reagents provide a method more suitable for routine standard assay of ANP than those currently available. Intra- and interassay CVs were 6% (n = 12) and 11% (n = 10), respectively. The mean concentration of ANP in plasma of 32 healthy volunteers was 33 (SEM 4) ng/L. The ANP values for plasma after one- step incubation correlated well with those determined by a commercial RIA kit: r = 0.971, slope = 1.099, intercept = 1.949 ng/L (n = 25).


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