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42 CFR §493.929

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.