{"data":{"id":"us/42-cfr-493.857","jurisdiction":"us","citation":"42 CFR 493.857","heading":"Condition: Immunohematology.","body":"The specialty of immunohematology includes four subspecialties for the purposes of proficiency testing: ABO group and D (Rho) typing; unexpected antibody detection; compatibility testing; and antibody identification.","path":["Title 42—Public Health","CHAPTER IV—CENTERS FOR MEDICARE \u0026 MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER G—STANDARDS AND CERTIFICATION","PART 493—LABORATORY REQUIREMENTS","Subpart H—Participation in Proficiency Testing for Laboratories Performing Nonwaived Testing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-42.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:11Z","sha256":"71a12a21190d20b823ef2744534395a0f2acd8b2b8a0ca8599745954d2a19de8","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-493.855","next":"us/42-cfr-493.859"},"notice":"GroundRules: Original legal text. Not legal advice."}