Thromb Haemost 1994; 71(04): 520-525
DOI: 10.1055/s-0038-1642471
Scientific and Standardization Committee Communications
Schattauer GmbH Stuttgart

A Revised Classification of von Willebrand Disease

For the Subcommittee on von Willebrand Factor of the Scientific and Standardization Committee of the International Society on Thrombosis and Haemostasis
J Evan Sadler
The Howard Hughes Medical Institute, The Jewish Hospital of St. Louis, Departments of Medicine and of Biochemistry and Molecular Biophysics, Washington University, School of Medicine, St. Louis, MO, USA
› Author Affiliations
Further Information

Publication History

Publication Date:
06 July 2018 (online)


A simplified phenotypic classification of von Willebrand disease is proposed that is based on differences in pathophysiology. Quantitative defects arc divided into partial deficiency (type 1) and severe deficiency (type 3). Qualitative defects (type 2) are divided into four subcategories. Type 2A refers to variants with decreased platelet-dependent function associated with the loss of high-molecular weight VWF multimers. Type 2B refers to variants with increased affinity for platelet glycoprotein lb. Type 2M refers to qualitatively abnormal variants with decreased platelet-dependent function not associated with the loss of high-molecular weight multimers. Type 2N refers to variants with decreased affinity for factor VIII. When recognized, mixed phenotypes caused by compound heterozygosity are indicated by separate classification of each allele. Standard amino acid and nucleotide numbering schemes are recommended for the description of mutations.

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