NCIt definition : A measurement of the clotting time of plasma recalcified in the presence of excess
tissue thromboplastin; it is a measure of the extrinsic pathway of coagulation. It
is used to determine the clotting tendency of blood, in the measure of warfarin dosage,
liver damage and vitamin K status. Factors measured are fibrinogen, prothrombin, and
factors V, VII, and X.;
Alternative definition : CDISC: A blood clotting measurement that evaluates the extrinsic pathway of coagulation.;