Semin Thromb Hemost 2008; 34(7): 670-682
DOI: 10.1055/s-0028-1104546
© Thieme Medical Publishers

Standardization and Clinical Utility of Thrombin-Generation Assays

Erik Berntorp1 , Gian Luca Salvagno2
  • 1Malmö Centre for Thrombosis and Haemostasis, Malmö University Hospital, Malmö, Sweden
  • 2Department of Clinical Chemistry, Verona University Hospital, Verona, Italy
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Publikationsdatum:
15. Dezember 2008 (online)

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ABSTRACT

Thrombin generation is a key process that determines the extent of a hemostatic plug or a thrombotic process. The ensuing thrombin burst is crucial for the formation of a stable fibrin clot. During its active life, thrombin exerts a multitude of highly regulated actions on the blood and the vessel wall, including the clotting of fibrinogen. The inappropriate generation of thrombin may lead to pathologic processes, foremost of which are hemorrhagic or thrombotic diseases. The coagulation system is usually investigated by means of two in vitro classic clotting tests, the activated partial thromboplastin time (APTT) and prothrombin time (PT), which assess only time to initiation of clot formation and do not entirely reflect global hemostatic balance. The APTT and PT permit identification of connectivity between the component activities identified as required for plasma coagulation and define the concept of intrinsic and extrinsic coagulation pathways, which converge at the point of formation of the prothrombinase complex. However, the mechanisms established by in vitro tests are not always mirrored in the human pathologies associated with bleeding or thrombosis. The recent development of newer tests based on the continuous registration of thrombin generation under in vitro conditions that mimic more closely what occurs in vivo prompt a reinvestigation of the balance between procoagulants and anticoagulants in patients with various hemostatic disorders. Thrombin-generation assays not only provide an overall assessment of hemostasis but also target potential extrahemostatic effects of the generated thrombin, a potent agonist of a multitude of cellular activation pathways. Moreover, estimation of an individual's thrombin-generation potential may correlate more closely with a hypercoagulable or hypocoagulable phenotype when compared with traditional coagulation tests. In this review, we discuss to what extent thrombin generation can be expected to reflect the clotting function of blood, the development and use of different thrombin-generation assay systems suitable for detecting changes in the kinetics of thrombin generation, and the clinical utility of thrombin generation.

REFERENCES

Gian Luca SalvagnoM.D. 

Sezione di Chimica e Microscopia Clinica, Dipartimento di Scienze Morfologico-Biomediche

Università degli Studi di Verona, Ospedale Policlinico G.B. Rossi, Piazzale Scuro, 10, 37134 – Verona, Italy

eMail: gsalvagno77@yahoo.it

eMail: gianluca.salvagno@univr.it