Abstract
The activation of the extrinsic coagulation pathway occurs after endothelial injury when the tissue factor (TF), a transmembrane protein located outside the vasculature, binds factor VII (FVII) or activated FVII (FVIIa). Once formed, the TF-VIIa complex activates both factor IX and X and initiates the coagulation process. The TF-VIIa complex is inhibited by both TF pathway inhibitor (TFPI) and antithrombin (AT). The interaction between TF-VIIa and AT induces FVIIa-AT complex formation, which is released into the plasma. Because AT reacts with FVIIa only when it is bound to TF, the circulating levels of FVIIa-AT reflect the degree of exposure of TF to blood. Preliminary clinical studies have shown higher plasma levels of FVIIa-AT complex both in patients with a prior arterial or venous thrombotic event. Increased plasma levels of FVIIa-AT have also been reported in a number of other prothrombotic conditions – antiphospholipid antibodies, solid and hematological malignancies, pre-eclampsia (PE), obesity and cardiac surgery. However, most of the studies published so far are retrospective and with a limited sample size. Larger prospective clinical studies are needed to confirm these findings and to assess the prognostic role of this possible new biomarker for activated coagulation.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: Barry Woodhams used to act as a consultant for Diagnostica Stago via Haemacon Ltd.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Editorial
- The central role of external quality assurance in harmonisation and standardisation for laboratory medicine
- Review
- Fecal calprotectin in inflammatory bowel diseases: update and perspectives
- Mini Review
- Factor VIIa-antithrombin complex: a possible new biomarker for activated coagulation
- Opinion Papers
- Improving quality in the preanalytical phase through innovation, on behalf of the European Federation for Clinical Chemistry and Laboratory Medicine (EFLM) Working Group for Preanalytical Phase (WG-PRE)
- Metabolite profiling can change health-care delivery to obese patients with fatty liver disease: the search for biomarkers
- Genetics and Molecular Diagnostics
- Rapid screening for targeted genetic variants via high-resolution melting curve analysis
- Evaluation of the new cobas® HCV genotyping test based on real-time PCRs of three different HCV genome regions
- General Clinical Chemistry and Laboratory Medicine
- Harmonisation of serum dihydrotestosterone analysis: establishment of an external quality assurance program
- Spanish Preanalytical Quality Monitoring Program (SEQC), an overview of 12 years’ experience
- Peer groups splitting in Croatian EQA scheme: a trade-off between homogeneity and sample size number
- Prevalence of pseudonatremia in a clinical laboratory – role of the water content
- Retrospective validation of a β-trace protein interpretation algorithm for the diagnosis of cerebrospinal fluid leakage
- Economic evaluation of procalcitonin-guided antibiotic therapy in acute respiratory infections: a Chinese hospital system perspective
- Performance evaluation of ImmunoCAP® ISAC 112: a multi-site study
- Clinical autoantibody detection by microarray
- Cardiovascular Diseases
- Kinetics of troponin I in patients with myocardial injury after noncardiac surgery
- Infectious Diseases
- P35 and P22 Toxoplasma gondii antigens abbreviate regions to diagnose acquired toxoplasmosis during pregnancy: toward single-sample assays
- Letters to the Editor
- Deciphering a macro-troponin I complex; a case report
- Interference of laboratory disinfection with trichloro-isocyanuric acid on cardiac troponin I measurement using the Vitros immunoassay system
- Massive interference in free T4 and free T3 assays misleading clinical judgment
- In defense of aldosterone measurement by immunoassay: a broader perspective
- The prevalence of hemolysis – a survey using hemolysis index
- Detection of BRAFV600K mutant tumor-derived DNA in the pleural effusion from a patient with metastatic melanoma
- Evaluation of the accuracy of the Greiner Bio-One FC Mix Glucose tube
- Congress Abstracts
- 4th EFLM-BD European Conference on Preanalytical Phase Amsterdam (NL), 24–25 March 2017
Artikel in diesem Heft
- Frontmatter
- Editorial
- The central role of external quality assurance in harmonisation and standardisation for laboratory medicine
- Review
- Fecal calprotectin in inflammatory bowel diseases: update and perspectives
- Mini Review
- Factor VIIa-antithrombin complex: a possible new biomarker for activated coagulation
- Opinion Papers
- Improving quality in the preanalytical phase through innovation, on behalf of the European Federation for Clinical Chemistry and Laboratory Medicine (EFLM) Working Group for Preanalytical Phase (WG-PRE)
- Metabolite profiling can change health-care delivery to obese patients with fatty liver disease: the search for biomarkers
- Genetics and Molecular Diagnostics
- Rapid screening for targeted genetic variants via high-resolution melting curve analysis
- Evaluation of the new cobas® HCV genotyping test based on real-time PCRs of three different HCV genome regions
- General Clinical Chemistry and Laboratory Medicine
- Harmonisation of serum dihydrotestosterone analysis: establishment of an external quality assurance program
- Spanish Preanalytical Quality Monitoring Program (SEQC), an overview of 12 years’ experience
- Peer groups splitting in Croatian EQA scheme: a trade-off between homogeneity and sample size number
- Prevalence of pseudonatremia in a clinical laboratory – role of the water content
- Retrospective validation of a β-trace protein interpretation algorithm for the diagnosis of cerebrospinal fluid leakage
- Economic evaluation of procalcitonin-guided antibiotic therapy in acute respiratory infections: a Chinese hospital system perspective
- Performance evaluation of ImmunoCAP® ISAC 112: a multi-site study
- Clinical autoantibody detection by microarray
- Cardiovascular Diseases
- Kinetics of troponin I in patients with myocardial injury after noncardiac surgery
- Infectious Diseases
- P35 and P22 Toxoplasma gondii antigens abbreviate regions to diagnose acquired toxoplasmosis during pregnancy: toward single-sample assays
- Letters to the Editor
- Deciphering a macro-troponin I complex; a case report
- Interference of laboratory disinfection with trichloro-isocyanuric acid on cardiac troponin I measurement using the Vitros immunoassay system
- Massive interference in free T4 and free T3 assays misleading clinical judgment
- In defense of aldosterone measurement by immunoassay: a broader perspective
- The prevalence of hemolysis – a survey using hemolysis index
- Detection of BRAFV600K mutant tumor-derived DNA in the pleural effusion from a patient with metastatic melanoma
- Evaluation of the accuracy of the Greiner Bio-One FC Mix Glucose tube
- Congress Abstracts
- 4th EFLM-BD European Conference on Preanalytical Phase Amsterdam (NL), 24–25 March 2017