The current system of human platelet antigen (HPA) nomenclature, adopted in 1990, is overseen by the Platelet Nomenclature Committee of the ISBT and the International Society on Thrombosis and Haemostasis.19-21 As with blood groups, there are platelet antigen systems and specific antigens within those systems. The HPA nomenclature pertains to “all protein alloantigens expressed on the platelet membrane, except those coded by genes of the major histocompatibility complex (MHC).”21(p241) (See 15.8.5, Immunology, HLA/Major Histocompatibility Complex.) Currently, there are 6 HPA systems: HPA-1, HPA-2, HPA-3, HPA-4, HPA-5, and HPA-15.21
CD designation of glycoprotein:
For CD (clusters of differentiation) nomenclature, see 15.8.7, Immunology, Lymphocytes. For gene and allele nomenclature, see 15.6.2, Genetics, Human Gene Nomenclature. For database identifiers and nucleotide nomenclature, see 15.6.1 Genetics, Nucleic Acids and Amino Acids.