{"data":{"id":"us/42-cfr-493.929","jurisdiction":"us","citation":"42 CFR 493.929","heading":"Chemistry.","body":"The subspecialties under the specialty of chemistry for which a proficiency testing program may offer proficiency testing are routine chemistry, endocrinology, and toxicology. Specific criteria for these subspecialties are listed in §§ 493.931 through 493.939.","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":"5489dba442a97de0aef87bf4be358a8e1cad36116cf9939aa9f7aa95a7c116b6","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-493.927","next":"us/42-cfr-493.931"},"notice":"GroundRules: Original legal text. Not legal advice."}