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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...
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.
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...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
Introduction to Hemostasis01:05

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...

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Related Experiment Video

Updated: Jul 8, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

The recalcified coagulation activity.

Thomas W Stief1

  • 1Department of Laboratory Medicine, University Hospital, Marburg, Germany. thstief@med.uni-marburg.de

Clinical and Applied Thrombosis/Hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
|December 28, 2007
PubMed
Summary
This summary is machine-generated.

This study quantifies thrombin activity in recalcified plasma, finding that pooling plasma and specific thawing methods enhance thrombin generation. This method aids in diagnosing prothrombotic states.

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Related Experiment Videos

Last Updated: Jul 8, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
04:56

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

Published on: August 4, 2023

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Area of Science:

  • Biochemistry
  • Hematology
  • Clinical Chemistry

Background:

  • Thrombin generation following plasma recalcification is crucial for hemostasis.
  • Assessing thrombin activity provides insights into coagulation dynamics and potential thrombotic states.

Purpose of the Study:

  • To develop and validate a method for quantifying thrombin activity in recalcified plasma.
  • To investigate factors influencing thrombin generation, including plasma pooling, anticoagulant therapy, and freeze-thaw cycles.

Main Methods:

  • Citrated plasma was recalcified with calcium chloride.
  • Thrombin activity was measured using chromogenic substrates after incubation at 37°C.
  • Plasma samples included normal pooled plasma, patient samples (heparin/coumarin), and samples subjected to different storage conditions.

Main Results:

  • Normal recalcified plasma generated 0.1-0.2 IU/ml thrombin activity.
  • Pooling plasma increased thrombin generation threefold; heparin/coumarin use decreased it tenfold.
  • Freezing and thawing plasma influenced thrombin generation, with 37°C thawing yielding the highest increase.
  • Valid thrombin activity measurements require assessment during the ascending phase of the generation curve.

Conclusions:

  • The described method allows for the quantification of thrombin activity in recalcified plasma.
  • Factors such as plasma pooling, anticoagulant use, and storage conditions significantly impact thrombin generation.
  • This assay can be utilized for diagnosing prothrombotic states by analyzing thrombin generation patterns.