1 – Scheme overview

This external quality assessment scheme assesses the accuracy of D-Dimer and Von Willebrand Factor determination. The scheme covers the main techniques available on the market.

Statistical reports are sent with supporting comments from the expert clinical biologists who coordinate the scheme.

Participating labs can choose to be assessed for all the analytes of this scheme, or simply a subset of analytes of interest.

2 – Assessment frequency

Number of investigations per year: 4
Number of control samples per investigation: 3
Number of samples per year : 12

4 concentration levels are assessed for D-Dimers and 2 levels are assessed for Von Willebrand Factor (Activity and Antigen).

3 – List of analytes assessed 

• D-Dimers: quantitative and qualitative evaluation based on the decision threshold
• Von Willebrand Factor – Antigen
• Von Willebrand Factor – Activity

4 – Description of the control samples

Lyophilized human control plasma (citrate) (samples to be resuspended in 1 mL of distilled water).