{"data":{"id":"us/21-cfr-864.8950","jurisdiction":"us","citation":"21 CFR 864.8950","heading":"Russell viper venom reagent.","body":"(a) Identification. Russell viper venom reagent is a device used to determine the cause of an increase in the prothrombin time.\n(b) Classification. Class I (general controls).","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 864—HEMATOLOGY AND PATHOLOGY DEVICES","Subpart I—Hematology Reagents"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"d9d97bdea4e86948e1c02fb4dddd63173707b2183dccec3613fc82ef60c465eb","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-864.8625","next":"us/21-cfr-864.9050"},"notice":"GroundRules: Original legal text. Not legal advice."}