CFR › Title 21 › Part 864 › §864.917521 CFR §864.9175Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. An automated blood grouping and antibody test system is a device used to group erythrocytes (red blood cells) and to detect antibodies to blood group antigens.(b)Classification. Class II (performance standards).