Clotting time of PLASMA recalcified in the presence of excess TISSUE THROMBOPLASTIN. Factors measured are FIBRINOGEN; PROTHROMBIN; FACTOR V; FACTOR VII; and FACTOR X. It is used for monitoring anticoagulant therapy with COUMARINS.

Synonyms: Time, Prothrombin, Russells Viper Venom Time, Russell's Viper Venom Time, Test, Quick, Prothrombin Time, Prothrombin Times, Russell Viper Venom Time, Thrombotest, Times, Prothrombin, Quick Test