Fibrinogen Assay
Fibrinogen Assay - Related Videos
04:36
Rapid Separation and Display of Active Fibrinogenolytic Agents in Sipunculus nudus through Fibrinogen-Polyacrylamide Gel Electrophoresis
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Cited by 2 •
2024
Here, we present a fibrinogen-polyacrylamide gel electrophoresis (PAGE) protocol to rapidly separate and display the fibrinogenolytic agents of Sipunculus nudus.
14:14
Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis
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Cited by 159 •
2007
This video demonstrates the protocol of an in vitro angiogenesis assay that recapitulates several stages of angiogenesis. Time-lapse images of sprouting, lumen formation, branching and anastomosis - key features of angiogenesis - are shown.
07:58
Invasion Assay Using 3D Matrices
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2023
The extracellular matrix (ECM) is a network of molecules that provide a structural framework for cells and tissues and helps facilitate intercellular communication. Three-dimensional cell culture techniques have been developed to more accurately model this extracellular environment for in vitro study. While many cell processes during migration through 3D matrices are similar to those required for movement across rigid 2D surfaces, including adherence, migration through ECM also requires cells...
09:23
Three-Dimensional Culture Assay to Explore Cancer Cell Invasiveness and Satellite Tumor Formation
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Cited by 4 •
2016
Cancer cells are embedded in a collagen gel and then sandwiched in an acellular fibrin gel to generate a 3D culture system in which the invasiveness and formation of satellite tumors may be monitored.
08:12
The TUNEL Assay
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2023
One of the hallmarks of apoptosis is the nuclear DNA fragmentation by nucleases. These enzymes are activated by caspases, the family of proteins that execute the cell death program. TUNEL assay is a method that takes advantage of this feature to detect apoptotic cells. In this assay, an enzyme called terminal deoxynucleotidyl transferase catalyzes the addition of dUTP nucleotides to the free 3’ ends of fragmented DNA. By using dUTPs that are labeled with chemical tags that can produce...
FAQs
The Clauss approach compares the time required for diluted plasma to form a fibrin clot after exposure to a high thrombin concentration with the response of a calibration standard. Because the assay emphasizes fibrinogen-dependent clot formation under controlled conditions, the measured clotting time can be related to functional fibrinogen levels rather than treated as an isolated time measurement.
A concentration measurement describes how much fibrinogen is present, whereas a functional measurement reflects whether that fibrinogen supports clot formation under the assay conditions. In the Clauss method, the clotting response provides this functional perspective. This distinction is useful in bioengineering when evaluating whether fibrinogen remains capable of contributing to fibrin formation in a biological or engineered system.
Plasma dilution and high thrombin concentration establish the controlled conditions used to evaluate fibrinogen-dependent clot formation. The resulting clotting time is then compared with a calibration standard, allowing the response to be interpreted consistently. These conditions help the assay focus on fibrinogen-related clot formation when characterizing samples associated with engineered materials, hydrogels, or coagulation systems.
Within the Clauss assay framework, shorter clotting times generally correspond to higher functional fibrinogen levels, while longer times indicate a lower functional response relative to the calibration standard. Interpretation should therefore rely on the standard comparison rather than on clotting time alone. This relationship provides a way to compare fibrin-forming performance among biological and engineered samples.
A basic workflow includes preparing the plasma sample at the required dilution, exposing it to a high concentration of thrombin, recording the time until a fibrin clot forms, and comparing that time with a calibration standard. The resulting comparison supports estimation of functional fibrinogen. In bioengineering studies, the same workflow can be applied to characterize relevant sample systems.
Bioengineering researchers can use this assay when studying blood-contacting materials, fibrin-based hydrogels, tissue-engineering scaffolds, or engineered coagulation systems. The measurement helps characterize clot formation and assess material hemocompatibility, meaning how a material performs in contact with blood. It can also support consistency checks for constructs made from biologically derived or synthetic components.
The data can indicate functional fibrin-forming behavior and contribute to evaluation of clot formation, material hemocompatibility, and construct consistency. These outcomes are relevant when comparing blood-contacting materials or assessing fibrin-based and tissue-engineering designs. Because the assay uses a calibration comparison, results can also support more consistent characterization across samples within an engineered coagulation study.