Clinical Chemistry
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Clinical Chemistry 36: 737-741, 1990;
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Clinical Chemistry, Vol 36, 737-741, Copyright © 1990 by American Association for Clinical Chemistry

Effects of methylamine and heparin on a rapid chromogenic assay of C1- esterase inhibitor in plasma

S Munkvad, J Jespersen, J Gram, K Overgaard and M Ranby
Department of Clinical Chemistry, Ribe County Hospital, Esbjerg, Denmark.

We describe a rapid assay of C1-esterase inhibitor (C1-inh) activity in plasma. After adding purified C1s serine protease (EC 3.4.21.42) in excess to plasma, we determine the residual C1s activity towards a new chromogenic tripeptide, CH3CO-Lys(CbO)-Gly-Arg-pNA. Optimal conditions include the addition of methylamine (final concentration 0.12 mol/L) to reduce the potential inhibitory capacity of alpha 2-macroglobulin towards C1s and the addition of heparin (final concentration 3000 int. units/L) to enhance the reaction of C1s with C1-inh. The correlation with C1-inh antigen concentrations in plasma was excellent. The estimated interassay CV was 4.3%, whereas the intra-assay CV was 2.0% for activity concentrations within the range of normal individuals (means +/- 2 SD: 70-124%), 1.3% at lower concentrations. The method is more convenient, rapid, and precise than previous methods, and C1-inh activity in plasma can be assessed within 30 min. We found that concentrations of C1-inh in plasma were low during open-heart bypass surgery.


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Copyright © 1990 by the American Association for Clinical Chemistry.