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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...
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...
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...
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.
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...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

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Related Experiment Video

Updated: Jul 19, 2026

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
08:01

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

Published on: February 27, 2026

Thrombin generation, a function test of the haemostatic-thrombotic system.

H Coenraad Hemker1, Raed Al Dieri, Erik De Smedt

  • 1Cardiovascular Research Institute (CARIM), P.O. Box 616, 6200 MD, Maastricht, The Netherlands. HC.Hemker@thrombin.com

Thrombosis and Haemostasis
|November 3, 2006
PubMed
Summary

Thrombin generation (TG) measurement provides a reliable method to assess bleeding or clotting risk. This thrombogram analysis aids in evaluating antithrombotic therapies and drug side effects.

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

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Thrombus Profiling Assay: A Microfluidics-Based Platform for Comprehensively Characterizing Biomechanical Thrombogenesis

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Last Updated: Jul 19, 2026

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
08:01

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

Published on: February 27, 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

Thrombus Profiling Assay: A Microfluidics-Based Platform for Comprehensively Characterizing Biomechanical Thrombogenesis
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Thrombus Profiling Assay: A Microfluidics-Based Platform for Comprehensively Characterizing Biomechanical Thrombogenesis

Published on: January 9, 2026

Area of Science:

  • Biochemistry
  • Hematology
  • Pharmacology

Background:

  • Thrombin generation (TG) is a critical process in hemostasis.
  • Assessing TG is vital for understanding bleeding and thrombotic risks.
  • Current methods for TG assessment can be complex and time-consuming.

Purpose of the Study:

  • To introduce a routine, high-throughput method for measuring thrombin generation (TG).
  • To evaluate the utility of the thrombogram, particularly the endogenous thrombin potential (ETP), in assessing hemostatic balance.
  • To explore the role of TG in drug research and clinical management of hemostatic disorders.

Main Methods:

  • Utilized a fluorogenic thrombin substrate for TG measurement.
  • Implemented continuous calibration for individual sample accuracy.
  • Developed an easy, high-throughput routine procedure for generating thrombin generation (TG) curves (thrombograms) in plasma.

Main Results:

  • Achieved an acceptable experimental error (<5%) in TG measurements.
  • Demonstrated that increased TG correlates with thrombotic tendency, while decreased TG is linked to bleeding risk.
  • Showed that TG reduction is a common effect of antithrombotic treatments, including anti-platelet drugs.

Conclusions:

  • The thrombogram is a promising tool for assessing bleeding and thrombotic risk.
  • TG measurement can guide antithrombotic and hemostatic treatment.
  • The thrombogram serves as a valuable tool in drug discovery and epidemiological studies.
  • Further research is needed to fully define the clinical limits of thrombogram analysis.