{"data":{"id":"us/21-cfr-660.26","jurisdiction":"us","citation":"21 CFR 660.26","heading":"Specificity tests and avidity tests.","body":"Specificity and avidity tests shall be performed using test procedures approved by the Director, Center for Biologics Evaluation and Research.","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER F—BIOLOGICS","PART 660—ADDITIONAL STANDARDS FOR DIAGNOSTIC SUBSTANCES FOR LABORATORY TESTS","Subpart C—Blood Grouping Reagent"],"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":"2fd4aa109be200d8f9cd68cc9b7b6cbe662519afec85671f7e8d48af3df143d5","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-660.25","next":"us/21-cfr-660.28"},"notice":"GroundRules: Original legal text. Not legal advice."}