What is thromboelastography (TEG)?

Updated: Apr 16, 2019
  • Author: Linda L Maerz, MD, FACS, FCCM; Chief Editor: Emmanuel C Besa, MD  more...
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First described by Hartert in 1948, thromboelastography records viscoelastic changes that occur during coagulation. A small volume of whole blood or plasma is placed into a mortar style cup, and a pestle is then inserted. The pestle rotates back and forth on a torsion wire that is attached to a monitoring device. As a clot forms, the pestle rotation is progressively retarded creating increased torsion on the torsion wire and a deflection on the tracing. The fibrin polymerization process is graphically depicted, including the rate of fibrin polymerization as well as overall clot strength and retraction.

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