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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
All Titles
Title 21
Chapter I
Part 660
Subpart A - Subpart A—Antibody to Hepatitis B Surface Antigen
§ 660.1 - Antibody to Hepatitis B Surface Antigen.
§ 660.2 - General requirements.
§ 660.3 - Reference panel.
§ 660.4 - Potency test.
§ 660.5 - Specificity.
§ 660.6 - Samples; protocols; official release.
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