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Related Concept Videos

Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...

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Related Experiment Video

Updated: May 12, 2026

Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis
14:14

Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis

Published on: April 29, 2007

Fibrinogen.

Linda J Stang1, Lesley G Mitchell

  • 1Department of Laboratory Medicine and Pathology, University of Alberta Hospital, Edmonton, AB, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

The Clauss fibrinogen assay is a key laboratory method for measuring fibrinogen, a crucial protein in blood clotting. This functional assay quantifies fibrinogen

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Rapid Separation and Display of Active Fibrinogenolytic Agents in Sipunculus nudus through Fibrinogen-Polyacrylamide Gel Electrophoresis
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Rapid Separation and Display of Active Fibrinogenolytic Agents in Sipunculus nudus through Fibrinogen-Polyacrylamide Gel Electrophoresis

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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

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Last Updated: May 12, 2026

Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis
14:14

Optimized Fibrin Gel Bead Assay for the Study of Angiogenesis

Published on: April 29, 2007

Rapid Separation and Display of Active Fibrinogenolytic Agents in Sipunculus nudus through Fibrinogen-Polyacrylamide Gel Electrophoresis
04:36

Rapid Separation and Display of Active Fibrinogenolytic Agents in Sipunculus nudus through Fibrinogen-Polyacrylamide Gel Electrophoresis

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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

Area of Science:

  • Hematology
  • Clinical Chemistry

Background:

  • Fibrinogen is essential for blood clot formation, acting as the final substrate in the coagulation cascade.
  • Laboratory measurement of fibrinogen is critical for assessing hemostasis and diagnosing bleeding disorders.

Purpose of the Study:

  • To detail the methodology and principles of the Clauss fibrinogen assay.
  • To provide an overview of alternative fibrinogen measurement techniques.

Main Methods:

  • The Clauss assay is a quantitative, clot-based functional test.
  • It measures fibrinogen's ability to form a clot upon addition of thrombin to diluted plasma.
  • Clotting time is measured and compared to a standard curve.

Main Results:

  • The Clauss assay is the most common method for fibrinogen quantification.
  • Pre-dilution of plasma minimizes interference from heparin and fibrinogen degradation products.
  • Alternative methods include prothrombin time-derived and antigenic assays.

Conclusions:

  • The Clauss fibrinogen assay is a reliable method for determining functional fibrinogen levels.
  • Understanding different fibrinogen assays aids in accurate coagulation assessment.
  • Accurate fibrinogen measurement is vital for patient care.