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Journal Article
Review
The use of soluble fibrin in evaluating the acute and chronic hypercoagulable state.
Thrombosis and Haemostasis 1999 August
Soluble fibrin detected in clinical plasma samples includes a variety of complexes consisting of fibrin monomer units, fibrinogen, and various proteolytic derivatives of fibrinogen and fibrin. The advantage of measuring soluble fibrin over fibrinopeptide A to detect thrombin action on fibrinogen is the considerably longer half-life of soluble fibrin in the circulation. Soluble fibrin can be detected by a variety of methods, including paracoagulation and precipitation assays, adsorption of fibrin monomer to insolubilized fibrinogen, functional assays based on the cofactor activity of some soluble fibrin compounds in t-PA-induced plasminogen activation, and by using fibrin-specific antibodies. Fibrin-specific antibodies may react with epitopes generated directly by fibrinopeptide A or B release or with epitopes generated by fibrin polymerization. Epitopes dependent on fibrinopeptide A release are often not accessible in native fibrin complexes and require the disaggregation of fibrin compounds to be reactive, whereas epitopes dependent on fibrinopeptide B release or fibrin polymerization are accessible to the monoclonal antibodies in nondenatured fibrin. Since soluble fibrin assays detect different structural or functional properties of soluble fibrin, no common calibrator for all soluble fibrin assays and, often, little correlation between different assay systems in clinical evaluations exist. Clinical applications of soluble fibrin assays include diagnosis and treatment monitoring of intravascular coagulation processes and prethrombotic states, monitoring anticoagulant treatment, and biocompatibility investigations. Some soluble fibrin assays have been demonstrated to be extremely sensitive indicators of acute fibrin formation. For the exclusion of venous thrombosis, D-dimer assays appear to be more sensitive than current soluble fibrin assays, since D-dimer assays detect freshly formed fibrin and proteolytic fragments of particulate clots. Further clinical studies are needed to establish the clinical utility of specific, soluble fibrin assays. The development of rapid, quantitative soluble fibrin assays for clinical routine use should be encouraged.
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