In future study, plasma samples with qualitative VWF abnormalities (e.g., type II VWD or acquired VWD patients demonstrating abnormal VWF function with variables VWF : Ag levels) could be included in the comparison study to confirm the application of the latex agglutination test for assessing VWF : Ag levels in various clinical situations. This evidence concerns the gene VWF and von Willebrand disease (hereditary or acquired).