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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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Updated: Jul 29, 2025

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
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Ecarin-Based Methods for Measuring Thrombin Inhibitors.

Robert C Gosselin1

  • 1Thrombosis & Hemostasis Center, University of California, Davis Health System, Sacramento, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|May 19, 2023
PubMed
Summary
This summary is machine-generated.

Ecarin, a viper venom, is crucial for lab tests like ecarin clotting time (ECT) and ecarin chromogenic assays (ECA). These assays monitor direct thrombin inhibitors such as dabigatran.

Keywords:
ArgatrobanBivalirudinDabigatranEcarinEcarin chromogenic assayEcarin clotting timeThrombin inhibitors

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Hematology

Background:

  • Ecarin, derived from Echis carinatus viper venom, activates prothrombin to meizothrombin.
  • Ecarin-based assays, including ecarin clotting time (ECT) and ecarin chromogenic assays (ECA), are established laboratory tools.
  • These assays were initially used to monitor hirudin, a direct thrombin inhibitor infusion.

Purpose of the Study:

  • To describe the procedures for performing manual ECT and both manual and automated ECA.
  • To highlight the application of ecarin-based assays in measuring direct thrombin inhibitors.
  • To detail the use of these assays for evaluating dabigatran's pharmacokinetic and pharmacodynamic properties.

Main Methods:

  • Manual execution of ecarin clotting time (ECT).
  • Automated and manual performance of ecarin chromogenic assays (ECA).
  • Application of these assays for monitoring direct thrombin inhibitors.

Main Results:

  • Detailed procedural descriptions for manual ECT and automated/manual ECA are provided.
  • The utility of ecarin assays for monitoring direct thrombin inhibitors is demonstrated.
  • The assays are shown to be applicable for pharmacokinetic and pharmacodynamic assessments.

Conclusions:

  • Ecarin-based assays (ECT and ECA) are valuable tools for monitoring direct thrombin inhibitors.
  • These methods facilitate the assessment of drugs like dabigatran in clinical and research settings.
  • Standardized procedures for manual and automated assays ensure reliable measurement of thrombin inhibition.