Use of purified dermatan sulfate for heparin cofactor II (HC II) assay.

Abstract:

:HC II functional assays are generally preferred with respect to immunochemical assays. Nevertheless functional assays can be biased by the antithrombin III (AT III)-heparin complex activity; in fact trace amounts of heparin generally contaminate dermatan sulfate (DS) commercial preparations used as HC II reaction activators. We have employed a purified DS preparation showing these features: DS concentration 94.4%, chondroitin sulfate 5.6%, M.W. 21.4 kDa. The absence of any interference due to AT III-heparin complexes was verified in a kinetic HC II assay of some human plasma pools. The immunological inhibition of AT III by anti-AT III caused a minimal decrease (6-8%) of the reaction slope, attributable to AT III activity. Progressive increase of heparin concentration in the assay was effective only starting from 30 U/ml (the assay was carried out in the presence of polybrene to prevent any AT III activation). The reference interval (mean +/- SD) obtained from 157 normal subjects was 100.8 +/- 20.2%; there was a good correlation with immunoreactive HC II. The purified DS we have used seems suitable for routinary assays of HC II where a minimal interference due to AT III-heparin is required.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Ruzzenente O,Ghidini R,Poli G,Schiavon R,Guidi GC

doi

10.1016/0049-3848(92)90248-9

subject

Has Abstract

pub_date

1992-01-15 00:00:00

pages

281-7

issue

2

eissn

0049-3848

issn

1879-2472

journal_volume

65

pub_type

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