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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...
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.
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...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu01:29

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...

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Updated: May 21, 2026

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

A C Goodeve1, D J Perry, T Cumming

  • 1Sheffield Diagnostic Genetics Service, Sheffield Children's NHS Foundation Trust and Haemostasis Research Group, Department of Cardiovascular Science, Sheffield, UK.

Haemophilia : the Official Journal of the World Federation of Hemophilia
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Genetic studies have advanced the understanding and diagnosis of congenital bleeding disorders like hemophilia A and B. Molecular techniques and reference materials improve genetic diagnosis and carrier detection for better patient care.

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Area of Science:

  • Hematology
  • Medical Genetics

Background:

  • Congenital bleeding disorders arise from defects in platelets or plasma coagulation proteins.
  • Severe phenotypes, common in hemophilia A, B, and von Willebrand disease type 3, lead to spontaneous, critical bleeds.
  • Defects in other coagulation factors are rare, affecting 1 in 1-2 million individuals.

Purpose of the Study:

  • To review the evolution of genetic investigations in bleeding disorders over 50 years.
  • To highlight recent molecular techniques for improved genetic diagnosis.
  • To discuss the role of proficiency testing and reference materials in genetic diagnostics.

Main Methods:

  • Review of molecular genetic studies on human coagulation factors (VIII and IX).
  • Analysis of advancements in molecular techniques for genetic diagnosis.
  • Evaluation of proficiency testing programs and reference materials.

Main Results:

  • Molecular genetics has enhanced understanding of bleeding disorder biology.
  • Improved carrier detection and genetic counseling are direct outcomes.
  • New therapeutic strategies have been developed based on genetic insights.

Conclusions:

  • Genetic investigations have transformed bleeding disorder diagnosis and management.
  • Advances in molecular techniques and quality control (proficiency testing, reference materials) are crucial for accurate genetic diagnosis.
  • Continued research in genetics offers further improvements in patient care and therapeutic options.