21 C.F.R. § 864.8950Download PDFCurrent through September 30, 2024Section 864.8950 - Russell viper venom reagent(a)Identification. Russell viper venom reagent is a device used to determine the cause of an increase in the prothrombin time.(b)Classification. Class I (general controls). 21 C.F.R. §864.8950 45 FR 60637, Sept. 12, 1980