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Establishing reference intervals for von Willebrand factor multimers.

Marika Pikta1, Marc Vasse2, Kristi J Smock3

  • 1North Estonia Medical Centre, Department of Laboratory Medicine, Tallinn, Estonia.

Journal of Medical Biochemistry
|April 18, 2022
PubMed
Summary
This summary is machine-generated.

This study establishes reference intervals for von Willebrand factor (VWF) multimer fractions, aiding in the diagnosis of von Willebrand disease (VWD) subtypes. The new reference values provide crucial benchmarks for interpreting VWF:MM assay results.

Keywords:
quantitative analysisreference intervalsvon Willebrand factorvon Willebrand factor multimers

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Area of Science:

  • Hematology
  • Clinical Chemistry

Background:

  • Established von Willebrand factor (VWF) multimer (VWF:MM) assays are complex and lack standardization.
  • A new semi-automated VWF:MM assay (Sebia) requires established reference values for accurate interpretation.
  • Interpreting VWF:MM fractions is challenging due to the absence of established reference intervals.

Purpose of the Study:

  • To determine reference intervals for low molecular weight (LMWM), intermediate molecular weight (IMWM), and high molecular weight (HMWM) VWF multimers.
  • To provide benchmarks for the interpretation of VWF:MM assay results.

Main Methods:

  • International collaboration analyzed 131 samples from healthy individuals across four countries.
  • VWF:MM analysis was performed using a new semi-automated assay.
  • Reference intervals were calculated following CLSI C28-A3 guidelines.

Main Results:

  • Proposed reference intervals: LMWM 10.4-22.5%, IMWM 22.6-37.6%, HMWM 45.6-66.6%.
  • Significant age-related differences observed in IMWM and HMWM fractions.
  • Geographical variations noted in LMWM results between France and other regions.

Conclusions:

  • Quantifying VWF:MM fractions can assist in differentiating von Willebrand disease (VWD) subtypes.
  • The determined reference values are valuable for future research and establishing clinical decision limits.