{"data":{"id":"us/21-cfr-640.55","jurisdiction":"us","citation":"21 CFR 640.55","heading":"U.S. Standard preparation.","body":"A U.S. Standard Antihemophilic Factor (Factor VIII) preparation may be obtained from the Center for Biologics Evaluation and Research, (HFM-407) (see mailing addresses in § 600.2 of this chapter) for use in the preparation of a working reference to be employed in a quality control potency test of Cryoprecipitated AHF.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER F—BIOLOGICS","PART 640—ADDITIONAL STANDARDS FOR HUMAN BLOOD AND BLOOD PRODUCTS","Subpart F—Cryoprecipitate"],"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":"38f56c1f98e01dbaac8783f8648172cf6194c92f0b6403b42768c1919c1e0cc6","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-640.54","next":"us/21-cfr-640.56"},"notice":"GroundRules: Original legal text. Not legal advice."}