Anti-alpha-2-HS-glycoprotein antibodies are used in the immunodetection of the protein encoded by the AHSG gene. In humans, the canonical protein has a reported length of 367 amino acid residues and a mass of 39.3 kDa. It is known to be a secreted protein. A member of the Fetuin protein family, it is reported to promote endocytosis, possesses opsonic properties and influences the mineral phase of bone. Post-translational modifications have been described, including O-glycosylation, N-glycosylation and phosphorylation. Other names for this target antigen include AHS, APMR1, FETUA, HSGA, alpha-2-Z-globulin, ba-alpha-2-glycoprotein, fetuin-A, and A2HS.