{"data":{"id":"us/42-cfr-493.839","jurisdiction":"us","citation":"42 CFR 493.839","heading":"Condition: Chemistry.","body":"The specialty of chemistry includes for the purposes of proficiency testing the subspecialties of routine chemistry, endocrinology, and toxicology.","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":"1409db4d4b7e256d154fb0ee075a270299c0e31b24dd6fba54586b993d397306","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-493.837","next":"us/42-cfr-493.841"},"notice":"GroundRules: Original legal text. Not legal advice."}