Heparin cofactor II assay. Elimination of heparin and antithrombin-III effects.

Abstract:

:Functional assays for heparin cofactor II (HC-II) are based on the inactivation of thrombin by HC-II in the presence of dermatan sulfate (DS). Residual thrombin is measured in a chromogenic assay. Interference by the antithrombin-III (AT-III)/heparin complex, which also rapidly inactivates thrombin, must be eliminated from the HC-II test system. Commercial DS is contaminated with heparin, while plasma specimens to be tested contain AT-III. After NaNO2/acetic acid treatment of DS (to inactivate heparin), there was enough residual heparin to cause AT-III interference. Treatment of plasma with commercially available anti-AT-III antiserum largely, but not completely, removed AT-III interference from the HC-II assay. With commercially available reagents, both NaNO2/acetic acid treatment of DS and anti-AT-III treatment of plasma were needed to eliminate heparin/AT-III interference. Protamine sulfate inactivated DS as well as heparin and could not be used to reduce AT-III/heparin interference with the HC-II assay.

journal_name

Am J Clin Pathol

authors

Nakhleh R,Vogt JM,Edson JR

doi

10.1093/ajcp/89.3.353

subject

Has Abstract

pub_date

1988-03-01 00:00:00

pages

353-8

issue

3

eissn

0002-9173

issn

1943-7722

journal_volume

89

pub_type

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