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Related Concept Videos

Coagulation01:09

Coagulation

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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...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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...
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Introduction to Hemostasis01:05

Introduction to Hemostasis

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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,...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Related Experiment Video

Updated: Jun 18, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Routine Coagulation.

Emmanuel J Favaloro1, Leonardo Pasalic2

  • 1Haematology, Sydney Centres for Thrombosis and Haemostasis, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW 2145, Australia; School of Dentistry and Medical Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia; School of Medical Sciences, University of Sydney, Westmead Hospital, Westmead, New South Wales, Australia.

Clinics in Laboratory Medicine
|August 1, 2024
PubMed
Summary
This summary is machine-generated.

Routine coagulation tests, including prothrombin time (PT) and activated partial thromboplastin time (aPTT), are essential in hematology labs. Not all hemostasis tests are included in routine panels due to practical considerations.

Keywords:
Activated partial thromboplastin timeD-dimerFibrinogenProthrombin timeRoutine coagulationThrombin time

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Area of Science:

  • Clinical pathology
  • Hematology
  • Hemostasis testing

Background:

  • Routine coagulation tests are vital for diagnosing and monitoring hemostasis disorders.
  • Hematology laboratories commonly offer a core set of these tests 24/7 for urgent clinical needs.

Purpose of the Study:

  • To define the scope of 'routine coagulation' testing in clinical hematology.
  • To identify the specific hemostasis assays typically included in urgent laboratory panels.

Main Methods:

  • Review of common laboratory practices for hemostasis testing.
  • Identification of assays frequently ordered in emergency and routine settings.

Main Results:

  • Routine coagulation panels generally include prothrombin time (PT), international normalized ratio (INR), and activated partial thromboplastin time (aPTT).
  • Thrombin time, D-dimer, and fibrinogen assays may also be considered routine in some settings.
  • Other hemostasis tests, while feasible, are typically not included in all routine laboratory offerings.

Conclusions:

  • The definition of routine coagulation testing is centered around a core set of essential hemostasis assays.
  • Excluding certain tests from routine panels is based on practical and clinical utility considerations.