{"data":{"id":"us/21-cfr-866.5880","jurisdiction":"us","citation":"21 CFR 866.5880","heading":"Transferrin immunological test system.","body":"(a) Identification. A transferrin immunological test system is a device that consists of the reagents used to measure by immunochemical techniques the transferrin (an iron-binding and transporting serum protein) in serum, plasma, and other body fluids. Measurement of transferrin levels aids in the diagnosis of malnutrition, acute inflammation, infection, and red blood cell disorders, such as iron deficiency anemia.\n(b) Classification. Class II (performance standards).","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 866—IMMUNOLOGY AND MICROBIOLOGY DEVICES","Subpart F—Immunological Test Systems"],"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":"f533753c579dd11cab65d089751688c7182850bab6c383f5a13b39331339da15","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-866.5870","next":"us/21-cfr-866.5890"},"notice":"GroundRules: Original legal text. Not legal advice."}