Immunochemical analysis of active and inactive antithrombin III.

Abstract:

:Antithrombin III (AT) levels from normal and AT deficiency persons were measured by electroimmunoassay (EIA) and the results compared with a chromogenic assay (S2238). Discrepant results were obtained when plasma and serum were compared using one antiserum, and therefore did not always relate to functional activity. Another antiserum, however, when used was capable of differentiating active AT from inactive AT complexed with its proteases and demonstrated close correlation with all samples tested (r=0.97). The specificity of the antisera and consequent anomalous results were elucidated when purified human thrombin was added to plasma samples and subsequently reanalysed. Quantitative differences observed when serum samples were compared by single radial immunodiffusion and electroimmunoassay with one antiserum, illustrates the fundamental principle differences between the two methods. These results give some insight as to why previous anomalies with AT immunoassays have occurred. They also indicate that plasma and not serum should be used as clinical test material. AT antisera should be capable of recognizing and distinguishing free AT from AT/protease complexes if the results obtained by electroimmunoassay are to correlate with functional activity.

journal_name

Br J Haematol

authors

McKay EJ

doi

10.1111/j.1365-2141.1980.tb05967.x

subject

Has Abstract

pub_date

1980-10-01 00:00:00

pages

277-85

issue

2

eissn

0007-1048

issn

1365-2141

journal_volume

46

pub_type

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