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Serum Studies: Renal Function Tests01:24

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Formation of the Platelet Plug01:22

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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.
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Functional Groups02:45

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Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...
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Updated: Feb 13, 2026

Microfluidics in Assessing Platelet Function
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Microfluidics in Assessing Platelet Function

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Platelet function testing: dead or alive.

C Helten1, D Naguib1, L Dannenberg1

  • 1Department of Cardiology, Pulmonology, and Vascular Medicine, Medical Faculty, Heinrich Heine University Düsseldorf, University Hospital Düsseldorf, Cardiovascular Research Institute Düsseldorf (CARID), Dusseldorf, Germany.

Journal of Thrombosis and Haemostasis : JTH
|March 8, 2018
PubMed
Summary
This summary is machine-generated.

Platelet function assays yield significantly different results for high on-treatment platelet reactivity (HTPR) and low on-treatment platelet reactivity (LTPR). Further research is needed to determine the optimal assay for guiding antiplatelet therapy.

Keywords:
P2Y12 receptor antagonistsbleedingischemiapharmacodynamicsplatelet function tests

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Area of Science:

  • Cardiology
  • Pharmacology
  • Clinical Chemistry

Background:

  • High on-treatment platelet reactivity (HTPR) increases ischemic event risk, while low on-treatment platelet reactivity (LTPR) elevates bleeding risk.
  • Previous trials tailoring antiplatelet regimens based on platelet function have yielded inconsistent results.
  • The TROPICAL-ACS study demonstrated a benefit of tailored antiplatelet therapy, possibly due to the assay used.

Purpose of the Study:

  • To evaluate the comparability of results from three common platelet function assays.
  • To assess the prevalence of HTPR and LTPR across different assays in patients on dual antiplatelet therapy.

Main Methods:

  • Light transmission aggregometry (LTA), Multiplate impedance aggregometry (MP), and VASP phosphorylation assay (VASP) were used.
  • Platelet reactivity was analyzed in 23 patients receiving dual antiplatelet therapy (aspirin and clopidogrel).

Main Results:

  • Prevalence of HTPR varied significantly: 57% (LTA), 43% (VASP), and 13% (MP).
  • Prevalence of LTPR also differed: 9% (LTA), 0% (VASP), and 39% (MP).
  • In 17% of patients, one assay indicated HTPR while another indicated LTPR.

Conclusions:

  • Results from different platelet function assays are substantially non-comparable.
  • The optimal platelet function assay for guiding antiplatelet therapy requires further investigation.
  • Future trials should focus on validating the assay used in TROPICAL-ACS to potentially revive platelet function testing.