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Coagulation Cascade and Fibrinolysis Pathway: Assessment in the Laboratory

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Nonmalignant Hematology

Abstract

Hemostasis is maintained through interactions between whole-blood cellular components, the vascular endothelium, and pro- and anticoagulant plasma proteins such that net hemostasis is the result of the competing physiology of coagulation and fibrinolysis. Traditional hemostatic assessment involves plasma-based assays of coagulation proteins and evaluation of platelet number and function. This testing may not accurately reflect net hemostasis as each test evaluates variables semi-independently and provides minimal/no information about fibrinolysis. Classic coagulation tests, including the prothrombin time (PT) and activated partial thromboplastin time (aPTT), were developed in the mid-twentieth century with little alteration other than automation since then (Martin et al. 1947; Goulian and Beck 1965). The PT measures the activity of the so-called extrinsic and common pathways of coagulation (Fig. 1), while the aPTT measures the intrinsic and common pathways. Thrombin time (TT) measures the common pathway and reflects the conversion of fibrinogen to fibrin. The division of the clotting cascade into the intrinsic, extrinsic, and common pathways has little in vivo validity, but has some conceptual utility in the interpretation of the results of laboratory investigation.

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Correspondence to Lindsey A. George MD .

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George, L.A., Lambert, M.P. (2016). Coagulation Cascade and Fibrinolysis Pathway: Assessment in the Laboratory. In: Abutalib, S., Connors, J., Ragni, M. (eds) Nonmalignant Hematology. Springer, Cham. https://doi.org/10.1007/978-3-319-30352-9_20

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  • DOI: https://doi.org/10.1007/978-3-319-30352-9_20

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