title: Reassessment of ABO blood group, sex, and age on laboratory parameters used to diagnose von Willebrand disorder: potential influence on the diagnosis vs the potential association with risk of thrombosis.
abstract: We reassessed the influence of ABO blood group, sex, and age on plasma levels of von Willebrand factor (vWF) antigen, vWF:ristocetin cofactor, vWF:collagen binding assay, and factor VIII coagulant (FVIII:C). Data show that levels of vWF and FVIII:C increase with increasing age (P < .001 for all parameters) and that the ABO blood group influences plasma levels such that O group levels are significantly less than non-O group levels. There was no significant association with sex and Rh status. The selection of normal ranges based on ABO blood groups may influence the clinical diagnosis of von Willebrand disease (vWD) but might not be clinically relevant or help identify people at increased risk of bleeding. Differences in ABO-related ranges were more extensive at the high end of the ranges. This is of particular interest because high levels of vWF and FVIII are associated with thrombosis risk, and an ABO relationship also has been described. O group individuals may or may not be at greater risk for bleeding (they have lower levels of vWF and FVIII:C) and are more likely to be diagnosed with vWD. It also is possible that O group status may be protective for thrombosis.
authors.affiliation: Department of Haematology, Institute of Clinical Pathology and Medical Research, Westmead Hospital, NSW, Australia.
authors.forename: Emmanuel J
authors.initials: EJ
authors.lastname: Favaloro
authors.forename: Soma
authors.initials: S
authors.lastname: Soltani
authors.forename: Jane
authors.initials: J
authors.lastname: McDonald
authors.forename: Ella
authors.initials: E
authors.lastname: Grezchnik
authors.forename: Leanne
authors.initials: L
authors.lastname: Easton
authors.forename: James W C
authors.initials: JW
authors.lastname: Favaloro
mesh_terms: D000017:ABO Blood-Group System / Q000097:blood*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000941:Antigens / Q000097:blood; D005169:Factor VIII / Q000032:analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012204:Rh-Hr Blood-Group System / Q000097:blood; D012307:Risk Factors; D012737:Sex Factors; D014842:von Willebrand Diseases / Q000097:blood* / Q000175:diagnosis*; D014841:von Willebrand Factor / Q000032:analysis
chemical_list: D000017:ABO Blood-Group System; D000941:Antigens; D012204:Rh-Hr Blood-Group System; C029417:Von Willebrand antigen; D014841:von Willebrand Factor; D005169:Factor VIII