Contribution of the collagen binding activity (VWF:CB) in the range of tests for the diagnosis and classification of von Willebrand disease.

Abstract

Von willebrand disease (VWD) is a common inherited bleeding disorder. The diagnosis may need a large panel of tests that differ in term of sensibility and specificity, and because of the effect of multifactorial modifiers (genetic or environmental); there is difficulty in defining diagnostic limits. We performed a panel of tests on 19 patients suffering from recurrent bleeding, to diagnose and classify VWD subtypes, by introducing the von Willebrand factor (VWF) collagen binding test (VWF:CB), then comparing the results with the activity of VWF risticetin cofactor (VWF:RCo) and multimer pattern. We considered 30% limit rate of VWF, as described by many authors, to make the diagnosis of VWD. The diagnosis of type 1 of VWD has been confirmed in 7patients, subtype 2A in 2 patients, subtype 2M in 2 patients and type 3 in 2 patients. We also defined a new group of 6 patients named "uncertain type 1" that didn't fill into the type 1 diagnostic criterion. The comparison between VWF:CB and VWF:RCo showed good correlation for all types of VWD except for type 2 while comparison between VWF:CB and multimer pattern showed good concordance for all types of VWD diagnosed. In conclusion, VWF:CB can be a good alternative to VWF:RCo for the diagnosis of quantitative deficiencies of VWF. It can also replace the multimer pattern study. However, the introduction of VWF:CB didn't help in the diagnosis of the "uncertain type 1" group of patients and cannot be a replacement for qualitative defect.

• Authors: Meriem Yasmine Ferhat-Hamida, Houda Boukerb, Ghania Hariti
• Journal: Annales de biologie clinique (Ann Biol Clin (Paris)) 2015 Jul-Aug Vol. 73 Issue 4 Pg. 461-8 ISSN: 1950-6112 [Electronic] France
• PMID: 26411913 (Publication Type: Journal Article)

Chemical References

• von Willebrand Factor
• Collagen

Topics

• Adolescent
• Adult
• Collagen (metabolism)
• Female
• Hematologic Tests
• Humans
• Male
• von Willebrand Diseases (blood, classification, diagnosis)
• von Willebrand Factor (analysis)