StacksVerified U.S. regulatory reference

42 CFR §493.921

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