{"data":{"id":"us/42-cfr-493.921","jurisdiction":"us","citation":"42 CFR 493.921","heading":"Diagnostic immunology.","body":"The subspecialties under the specialty of immunology for which a program may offer proficiency testing are syphilis serology and general immunology. Specific criteria for these subspecialties are found at §§ 493.923 and 493.927.","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 I—Proficiency Testing Programs for 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":"3be867e93f79d951b4029d21b14759924b73a990aecafe4eadfef0466701aed1","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-493.919","next":"us/42-cfr-493.923"},"notice":"GroundRules: Original legal text. Not legal advice."}