title: Bleeding time, blood groups and von Willebrand factor.
abstract: The bleeding time in healthy volunteers was determined according to both the Ivy and the Simplate II techniques. A significantly longer bleeding time in people with blood group O than in people with non-O blood groups was demonstrated with both techniques. This difference could not be attributed to a difference in sex ratio, platelet count or haematocrit. The mean level of von Willebrand factor in blood group O is lower than in non-O blood groups, but we found no association between the level of von Willebrand factor and the bleeding time, despite the very broad range of von Willebrand factor levels in the subjects examined.
authors.affiliation: Department of Haematology, University Hospital Leiden, The Netherlands.
authors.forename: K M
authors.initials: KM
authors.lastname: Caekebeke-Peerlinck
authors.forename: T
authors.initials: T
authors.lastname: Koster
authors.forename: E
authors.initials: E
authors.lastname: Briët
mesh_terms: D000017:ABO Blood-Group System; D001760:Bleeding Time; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D008297:Male; D010979:Platelet Function Tests; D012016:Reference Values; D012737:Sex Factors; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D014841:von Willebrand Factor