Immunonephelometric determination of the C4b-binding protein.
Thromb Res
; 69(4): 343-51, 1993 Feb 15.
Article
em En
| MEDLINE
| ID: mdl-8470056
ABSTRACT
A fully mechanised immunonephelometric method for the rapid and specific determination of C4b-binding protein (C4b-BP) in citrated plasma is described. The method utilizes commercially available rabbit antiserum against human C4b-BP and a nephelometer analyser. A single determination can be performed within 6 min, requiring 80 microliters sample volume. The measuring range is about 10 to 200% of normal C4b-BP. Precision is characterized by intraassay coefficients of variation between 1.5% and 2.8%, and interassay coefficients of variation between 4.0% and 4.6% for the same C4b-BP concentrations. The nephelometry of C4b-BP was correlated with electroimmunodiffusion (Laurell technique; r = 0.863, y = 0.909x+7.091, n = 79). C4b-BP concentrations (143%, 96-223%; median and 2.5th-97.5th percentile) from 83 subjects with increased inflammation markers C-reactive protein (> 10 mg/l), and fibrinogen (> 4.5 g/l) showing significantly higher C4b-BP concentrations compared to 151 obviously healthy subjects (97%, 68-141%; p < 0.001). In contrast to 81 patients with therapeutic heparinisation (90%, 60-131%) significant decreased concentrations were found in 90 subjects under oral anticoagulant therapy (OAT) in the stable state (78%, 44-125%; p < 0.001). Depending on different INR levels (< 2.5, n = 40 71%, 63-85%; > 2.5, n = 50 81%, 68-92%; median and 25th-75th percentile) no significant differences of C4b-BP concentrations could be measured.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas Inativadoras do Complemento
/
Glicoproteínas
/
Proteínas de Transporte
/
Complemento C4b
/
Nefelometria e Turbidimetria
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Thromb Res
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Alemanha