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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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Related Experiment Video

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Platelet neutralization test.

Kottayam Radhakrishnan1

  • 1Department of Clinical Haematology, Royal Children's Hospital, Melbourne, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|April 3, 2013
PubMed
Summary

The platelet neutralization test aids in diagnosing lupus anticoagulant (LA) by observing how added platelets correct prolonged clotting times. This confirms LA

Area of Science:

  • Hematology
  • Clinical Diagnostics
  • Immunology

Background:

  • Lupus anticoagulant (LA) is an antibody that can cause blood clots.
  • LA prolongs phospholipid-dependent coagulation tests like APTT and DRVVT.
  • The phospholipid-dependent nature of LA is key to its diagnosis.

Purpose of the Study:

  • To explain the diagnostic principle of the platelet neutralization test for lupus anticoagulant.
  • To highlight how platelet addition corrects LA-induced clotting abnormalities.

Main Methods:

  • The platelet neutralization test involves adding "fractured" platelets to patient plasma.
  • Coagulation tests (e.g., APTT, DRVVT) are repeated after platelet addition.
  • Correction of prolonged clotting times indicates the presence of LA.

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Last Updated: May 12, 2026

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Main Results:

  • Addition of platelets corrects the prolonged clotting times in samples with LA.
  • This correction demonstrates the phospholipid-dependent nature of LA.
  • Platelets appear to neutralize LA by absorbing it.

Conclusions:

  • The platelet neutralization test is a valuable laboratory method for diagnosing lupus anticoagulant.
  • The test leverages the interaction between LA and platelet-derived phospholipids.
  • Platelet absorption is the proposed mechanism for LA neutralization.