Russell's viper venom(redirected from Russell's viper venom viper venom time (RVVT))
poison, especially a toxic substance normally secreted by a serpent, insect, or other animal.
Russell's viper venom
the venom of Russell's viper (Vipera russelli), which acts in vitro as an instrinsic thromboplastin and is useful in defining deficiencies of blood clotting factor X.
Russell's viper venom viper venom time (RVVT)
a one-stage prothrombin time test, used to distinguish between deficiency of factor VII and factor X. Called also Stypven time.